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Chaocipher

From Rosetta Code
Task
Chaocipher
You are encouraged to solve this task according to the task description, using any language you may know.
Description

The Chaocipher was invented by J.F.Byrne in 1918 and, although simple by modern cryptographic standards, does not appear to have been broken until the algorithm was finally disclosed by his family in 2010.

The algorithm is described in this paper by M.Rubin in 2010 and there is a C# implementation here.


Task

Code the algorithm in your language and to test that it works with the plaintext 'WELLDONEISBETTERTHANWELLSAID' used in the paper itself.

11l[edit]

Translation of: Python
F correct_case(string)
R string.filter(s -> s.is_alpha()).map(s -> s.uppercase()).join(‘’)
 
F permu(String alp; num)
R alp[num..]‘’alp[0 .< num]
 
F rotate_wheels(lalph, ralph, key)
V newin = ralph.index(key)
R (permu(lalph, newin), permu(ralph, newin))
 
F scramble_wheels(String =lalph, String =ralph)
lalph = lalph[0]‘’lalph[2.<14]‘’lalph[1]‘’lalph[14..]
ralph = ralph[1.<3]‘’ralph[4.<15]‘’ralph[3]‘’ralph[15..]‘’ralph[0]
R (lalph, ralph)
 
F do_chao(=msg, =lalpha, =ralpha, en = 1B, show = 0B)
msg = correct_case(msg)
V out = ‘’
I show
print(‘=’ * 54)
print((10 * ‘ ’)‘left:’(21 * ‘ ’)‘right: ’)
print(‘=’ * 54)
print(lalpha‘ ’ralpha" \n")
L(l) msg
I en
(lalpha, ralpha) = rotate_wheels(lalpha, ralpha, l)
out ‘’= lalpha[0]
E
(ralpha, lalpha) = rotate_wheels(ralpha, lalpha, l)
out ‘’= ralpha[0]
(lalpha, ralpha) = scramble_wheels(lalpha, ralpha)
I show
print(lalpha‘ ’ralpha)
R out
 
V lalpha = ‘HXUCZVAMDSLKPEFJRIGTWOBNYQ’
V ralpha = ‘PTLNBQDEOYSFAVZKGJRIHWXUMC’
V msg = ‘WELLDONEISBETTERTHANWELLSAID’
 
print(‘L: ’lalpha)
print(‘R: ’ralpha)
print(‘I: ’msg)
V o = do_chao(msg, lalpha, ralpha, 1B, 0B)
print(‘O: ’o)
print(‘D: ’do_chao(o, lalpha, ralpha, 0B, 0B))
print()
 
do_chao(msg, lalpha, ralpha, 1B, 1B)
Output:
L: HXUCZVAMDSLKPEFJRIGTWOBNYQ
R: PTLNBQDEOYSFAVZKGJRIHWXUMC
I: WELLDONEISBETTERTHANWELLSAID
O: OAHQHCNYNXTSZJRRHJBYHQKSOUJY
D: WELLDONEISBETTERTHANWELLSAID

======================================================
          left:                     right: 
======================================================
HXUCZVAMDSLKPEFJRIGTWOBNYQ PTLNBQDEOYSFAVZKGJRIHWXUMC 

ONYQHXUCZVAMDBSLKPEFJRIGTW XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF OBMESWKYZXUCPRTLNHFAGVQDJI
YFJBGMTKWNOQXCHIDVALZRSPUE JIBMESWKYZXUCOPRTLNHFAGVQD

Ada[edit]

This solution uses array slices to permute the left and right strings. Use of slices clarifies the looping logic. Ada strings are indexed with the predefined subtype Positive which begins at 1.

 
with Ada.Text_IO; use Ada.Text_IO;
 
procedure chao_slices is
type iMode is (Encrypt, Decrypt);
 
L_Alphabet : String := "HXUCZVAMDSLKPEFJRIGTWOBNYQ";
R_Alphabet : String := "PTLNBQDEOYSFAVZKGJRIHWXUMC";
plaintext  : String := "WELLDONEISBETTERTHANWELLSAID";
ciphertext : String (1 .. plaintext'length);
plaintext2 : String (1 .. plaintext'length);
offset  : Natural;
 
function IndexOf (Source : String; Value : Character) return Positive is
Result : Positive;
 
begin
for I in Source'Range loop
if Source (I) = Value then
Result := I;
exit;
end if;
end loop;
return Result;
end IndexOf;
 
function Exec
(Text : String; mode : iMode; showsteps : Boolean := False) return String
is
etext : String (Text'First .. Text'Last);
temp  : String (1 .. 26);
index : Positive;
store : Character;
left  : String := L_Alphabet;
right : String := R_Alphabet;
begin
for I in Text'Range loop
if showsteps then
Put_Line (left & " " & right);
end if;
 
if mode = Encrypt then
index  := IndexOf (Source => right, Value => Text (I));
etext (I) := left (index);
else
index  := IndexOf (Source => left, Value => Text (I));
etext (I) := right (index);
end if;
 
exit when I = Text'Last;
 
-- permute left
-- The array value permutations are performed using array slices
-- rather than explicit loops
 
if index > 1 then
offset  := 26 - index;
temp (1 .. offset + 1) := left (index .. index + offset);
 
temp (offset + 2 .. 26) := left (1 .. index - 1);
store  := temp (2);
 
temp (2 .. 13) := temp (3 .. 14);
temp (14)  := store;
left  := temp;
 
-- permute right
-- The array value permutations are performed using array slices
-- rather than explicit loops
 
temp (1 .. offset + 1) := right (index .. index + offset);
 
temp (offset + 2 .. 26) := right (1 .. index - 1);
store  := temp (1);
 
temp (1 .. 25) := temp (2 .. 26);
temp (26)  := store;
store  := temp (3);
 
temp (3 .. 13) := temp (4 .. 14);
temp (14)  := store;
right  := temp;
end if;
 
end loop;
 
return etext;
 
end Exec;
begin
Put_Line ("The original text is : " & plaintext);
New_Line;
Put_Line
("The left and right alphabets after each permutation during encryption are:");
New_Line;
ciphertext := Exec (plaintext, Encrypt, True);
New_Line;
Put_Line ("The ciphertext is : " & ciphertext);
plaintext2 := Exec (ciphertext, Decrypt);
New_Line;
Put_Line ("The recovered plaintext is : " & plaintext2);
end chao_slices;
 
Output:
The original text is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are:

HXUCZVAMDSLKPEFJRIGTWOBNYQ  PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW  XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV  OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ  NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY  NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE  JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU  YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO  BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP  RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO  MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ  AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM  IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB  RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ  LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF  LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ  RYFWZXUCPTLNIHMSAVKGQDJOBE
RBSKWPEYHUFJIDLGMTONQXCVAZ  RYFWZXUCPTLNIHMSAVKGQDJOBE
UJIDLGMTONQXCFVAZRBSKWPEYH  LNHMSAVKGQDJOIBERYFWZXUCPT
ILGMTONQXCFVADZRBSKWPEYHUJ  MSVKGQDJOIBERAYFWZXUCPTLNH
DRBSKWPEYHUJIZLGMTONQXCFVA  YFZXUCPTLNHMSWVKGQDJOIBERA
HJIZLGMTONQXCUFVADRBSKWPEY  HMWVKGQDJOIBESRAYFZXUCPTLN
ILGMTONQXCUFVZADRBSKWPEYHJ  VKQDJOIBESRAYGFZXUCPTLNHMW
XUFVZADRBSKWPCEYHJILGMTONQ  SRYGFZXUCPTLNAHMWVKQDJOIBE
WCEYHJILGMTONPQXUFVZADRBSK  NAMWVKQDJOIBEHSRYGFZXUCPTL
KCEYHJILGMTONWPQXUFVZADRBS  NAWVKQDJOIBEHMSRYGFZXUCPTL
PXUFVZADRBSKCQEYHJILGMTONW  RYFZXUCPTLNAWGVKQDJOIBEHMS
KQEYHJILGMTONCWPXUFVZADRBS  WGKQDJOIBEHMSVRYFZXUCPTLNA
LMTONCWPXUFVZGADRBSKQEYHJI  BEMSVRYFZXUCPHTLNAWGKQDJOI

The ciphertext is : OAHQHCNYNXTSZJRRUIDHIXWKPKLY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

AppleScript[edit]

-- Chaocipher algorithm by J.F.Byrne 1918.
on chaocipher(input, |key|, mode)
-- input: text to be enciphered or deciphered.
-- |key|: script object or record with leftAlpha and rightAlpha properties, each of whose values is a shuffled alphabet text.
-- mode: the text "encipher" or "decipher".
script o
property inputChars : input's characters
property leftAlpha : |key|'s leftAlpha's characters
property rightAlpha : |key|'s rightAlpha's characters
property inAlpha : leftAlpha
property outAlpha : rightAlpha
property output : {}
end script
 
set alphaLen to (count o's leftAlpha)
if ((count o's rightAlpha) ≠ alphaLen) then error
if (mode is "encipher") then
set {o's inAlpha, o's outAlpha} to {o's rightAlpha, o's leftAlpha}
else if (mode is not "decipher") then
error
end if
set zenith to 1
set nadir to alphaLen div 2 + 1
repeat with char in o's inputChars
set char to char's contents
set found to false
repeat with i from 1 to alphaLen
if (o's inAlpha's item i = char) then
set end of o's output to o's outAlpha's item i
set found to true
exit repeat
end if
end repeat
if (found) then
rotate(o's leftAlpha, zenith, alphaLen, -(i - zenith))
rotate(o's leftAlpha, zenith + 1, nadir, -1)
rotate(o's rightAlpha, zenith, alphaLen, -i)
rotate(o's rightAlpha, zenith + 2, nadir, -1)
end if
end repeat
 
return join(o's output, "")
end chaocipher
 
on rotate(theList, l, r, amount)
set listLength to (count theList)
if (listLength < 2) then return
if (l < 0) then set l to listLength + l + 1
if (r < 0) then set r to listLength + r + 1
if (l > r) then set {l, r} to {r, l}
script o
property lst : theList
property storage : missing value
end script
 
set rangeLength to r - l + 1
set amount to (rangeLength + rangeLength - amount) mod rangeLength
if (amount is 0) then return
set o's storage to o's lst's items l thru (l + amount - 1)
repeat with i from (l + amount) to r
set o's lst's item (i - amount) to o's lst's item i
end repeat
set j to r - amount
repeat with i from 1 to amount
set o's lst's item (j + i) to o's storage's item i
end repeat
end rotate
 
on join(lst, delim)
set astid to AppleScript's text item delimiters
set AppleScript's text item delimiters to delim
set txt to lst as text
set AppleScript's text item delimiters to astid
return txt
end join
 
-- Return a script object containing a couple of randomised alphabets to use as a choacipher key.
on makeKey()
set lAlpha to "ABCDEFGHIJKLMNOPQRSTUVWXYZ"'s characters
copy lAlpha to rAlpha
script |key|
property leftAlpha : join(shuffle(lAlpha, 1, -1), "")
property rightAlpha : join(shuffle(rAlpha, 1, -1), "")
end script
 
return |key|
end makeKey
 
-- Fisher-Yates (aka Durstenfeld, aka Knuth) shuffle.
on shuffle(theList, l, r)
set listLength to (count theList)
if (listLength < 2) then return array
if (l < 0) then set l to listLength + l + 1
if (r < 0) then set r to listLength + r + 1
if (l > r) then set {l, r} to {r, l}
script o
property lst : theList
end script
 
repeat with i from l to (r - 1)
set j to (random number from i to r)
set v to o's lst's item i
set o's lst's item i to o's lst's item j
set o's lst's item j to v
end repeat
 
return theList
end shuffle
 
-- Demo using the two-alphabet key from the Rubin paper and another generated at random.
-- Decription must be with the key that was used for the encription.
on demo(originalText)
set key1 to {leftAlpha:"HXUCZVAMDSLKPEFJRIGTWOBNYQ", rightAlpha:"PTLNBQDEOYSFAVZKGJRIHWXUMC"}
set key2 to makeKey()
set enciphered to chaocipher(originalText, key1, "encipher")
set doubleEnciphered to chaocipher(enciphered, key2, "encipher")
set deDoubleEnciphered to chaocipher(doubleEnciphered, key2, "decipher")
set deciphered to chaocipher(deDoubleEnciphered, key1, "decipher")
return join({"Original text = " & originalText, ¬
"Enciphered = " & enciphered, "Double enciphered = " & doubleEnciphered, ¬
"De-double enciphered = " & deDoubleEnciphered, "Deciphered = " & deciphered}, linefeed)
end demo
demo("WELLDONEISBETTERTHANWELLSAID")
Output:
"Original text = WELLDONEISBETTERTHANWELLSAID
Enciphered = OAHQHCNYNXTSZJRRHJBYHQKSOUJY
Double enciphered = ZJVDGIXNNDNRHAXQUUJZGAFTANHW
De-double enciphered = OAHQHCNYNXTSZJRRHJBYHQKSOUJY
Deciphered = WELLDONEISBETTERTHANWELLSAID"

Arc[edit]

(= lshift '((0 1) (2 14) (1 2) (14 26)))
(= rshift '((1 3) (4 15) (3 4) (15 26) (0 1)))
 
(= rot (fn (alpha shift)
(let shift (mod shift 26)
(string (cut alpha shift) (cut alpha 0 shift)))))
 
(= scramble-wheel (fn (alpha moves)
(= oput '())
(up i 0 (- (len moves) 1)
(push (cut alpha ((moves i) 0) ((moves i) 1)) oput))
(= oput (string (rev oput)))))
 
(= chaocipher (fn (left right msg (o crypted) (o dec?))
(unless crypted
(prn "Encoding " msg " with chaocipher")
(prn left " " right))
(when dec? (swap left right))
(= offset ((positions (msg 0) right) 0))
(= left (rot left offset))
(= right (rot right offset))
(push (cut left 0 1) crypted)
(when dec? (swap left right))
(prn (scramble-wheel left lshift)
" " (scramble-wheel right rshift))
(if (> (len msg) 1)
(chaocipher (scramble-wheel left lshift)
(scramble-wheel right rshift)
(cut msg 1) crypted dec?)
(string (rev crypted)))))
 
(chaocipher "HXUCZVAMDSLKPEFJRIGTWOBNYQ" "PTLNBQDEOYSFAVZKGJRIHWXUMC"
"WELLDONEISBETTERTHANWELLSAID")
(chaocipher "HXUCZVAMDSLKPEFJRIGTWOBNYQ" "PTLNBQDEOYSFAVZKGJRIHWXUMC"
"OAHQHCNYNXTSZJRRHJBYHQKSOUJY" nil 1)
 
Output:
 
arc> (chaocipher "HXUCZVAMDSLKPEFJRIGTWOBNYQ" "PTLNBQDEOYSFAVZKGJRIHWXUMC"
"WELLDONEISBETTERTHANWELLSAID")
Encoding WELLDONEISBETTERTHANWELLSAID with chaocipher
HXUCZVAMDSLKPEFJRIGTWOBNYQ PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF OBMESWKYZXUCPRTLNHFAGVQDJI
YFJBGMTKWNOQXCHIDVALZRSPUE JIBMESWKYZXUCOPRTLNHFAGVQD
"OAHQHCNYNXTSZJRRHJBYHQKSOUJY"
 

AutoHotkey[edit]

LeftW := "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
RghtW := "PTLNBQDEOYSFAVZKGJRIHWXUMC"
 
PlainText := "WELLDONEISBETTERTHANWELLSAID"
CipherText := Chao_Cipher(PlainText, LeftW, RghtW) ; "OAHQHCNYNXTSZJRRHJBYHQKSOUJY"
DecipherText:= Chao_Decipher(CipherText, LeftW, RghtW) ; "WELLDONEISBETTERTHANWELLSAID"
 
MsgBox % Result := "Original text:`t" PlainText "`nCipher text:`t" CipherText "`nDecipher text:`t" DecipherText
return
;-------------------------------------------
Chao_Cipher(PT, LeftW, RghtW){
oRght:=StrSplit(RghtW), oLeft:=StrSplit(LeftW)
for i, p in StrSplit(PT){
result .= (c := Key2Val(oRght, oLeft, p))
oLeft:=Permute(oLeft, c, 1)
oRght:=Permute(oRght, p)
}
return result
}
;-------------------------------------------
Chao_Decipher(CT, LeftW, RghtW){
oRght:=StrSplit(RghtW), oLeft:=StrSplit(LeftW)
for i, c in StrSplit(CT){
result .= (p := Key2Val(oLeft, oRght, c))
oLeft:=Permute(oLeft, c, 1)
oRght:=Permute(oRght, p)
}
return result
}
;-------------------------------------------
Key2Val(Key, Val, char){
for i, ch in Key
if (ch = char)
return Val[i]
}
;-------------------------------------------
Permute(Arr, ch, dt:=0){
for i, c in Arr
if (c=ch)
break
loop % i-dt
Arr.Push(Arr.RemoveAt(1)) ; shift left
ch := Arr[3-dt] ; save 2nd/3rd chr
loop % 11+dt
Arr[A_Index+2-dt]:=Arr[A_Index+3-dt] ; shift pos 3/4-14 left
Arr[14] := ch ; place 2nd/3rd chr in pos 14
return Arr
}
Output:
Original text:	WELLDONEISBETTERTHANWELLSAID
Cipher text:	OAHQHCNYNXTSZJRRHJBYHQKSOUJY
Decipher text:	WELLDONEISBETTERTHANWELLSAID

C[edit]

Translation of: Kotlin
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
#define TRUE 1
#define FALSE 0
 
typedef int bool;
typedef enum { ENCRYPT, DECRYPT } cmode;
 
const char *l_alphabet = "HXUCZVAMDSLKPEFJRIGTWOBNYQ";
const char *r_alphabet = "PTLNBQDEOYSFAVZKGJRIHWXUMC";
 
void chao(const char *in, char *out, cmode mode, bool show_steps) {
int i, j, index;
char store;
size_t len = strlen(in);
char left[27], right[27], temp[27];
strcpy(left, l_alphabet);
strcpy(right, r_alphabet);
temp[26] = '\0';
 
for (i = 0; i < len; ++i ) {
if (show_steps) printf("%s  %s\n", left, right);
if (mode == ENCRYPT) {
index = strchr(right, in[i]) - right;
out[i] = left[index];
}
else {
index = strchr(left, in[i]) - left;
out[i] = right[index];
}
if (i == len - 1) break;
 
/* permute left */
 
for (j = index; j < 26; ++j) temp[j - index] = left[j];
for (j = 0; j < index; ++j) temp[26 - index + j] = left[j];
store = temp[1];
for (j = 2; j < 14; ++j) temp[j - 1] = temp[j];
temp[13] = store;
strcpy(left, temp);
 
/* permute right */
 
for (j = index; j < 26; ++j) temp[j - index] = right[j];
for (j = 0; j < index; ++j) temp[26 - index + j] = right[j];
store = temp[0];
for (j = 1; j < 26; ++j) temp[j - 1] = temp[j];
temp[25] = store;
store = temp[2];
for (j = 3; j < 14; ++j) temp[j - 1] = temp[j];
temp[13] = store;
strcpy(right, temp);
}
}
 
int main() {
const char *plain_text = "WELLDONEISBETTERTHANWELLSAID";
char *cipher_text = malloc(strlen(plain_text) + 1);
char *plain_text2 = malloc(strlen(plain_text) + 1);
printf("The original plaintext is : %s\n", plain_text);
printf("\nThe left and right alphabets after each permutation"
" during encryption are :\n\n");
chao(plain_text, cipher_text, ENCRYPT, TRUE);
printf("\nThe ciphertext is : %s\n", cipher_text);
chao(cipher_text, plain_text2, DECRYPT, FALSE);
printf("\nThe recovered plaintext is : %s\n", plain_text2);
free(cipher_text);
free(plain_text2);
return 0;
}
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are :

HXUCZVAMDSLKPEFJRIGTWOBNYQ  PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW  XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV  OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ  NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY  NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE  JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU  YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO  BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP  RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO  MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ  AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM  IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB  RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ  LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF  LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ  RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ  YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY  LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF  MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD  VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE  HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX  RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON  SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS  NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR  NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW  WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP  GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF  OBMESWKYZXUCPRTLNHFAGVQDJI

The ciphertext is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

C#[edit]

Translation of: D
using System;
 
namespace Chaocipher {
enum Mode {
ENCRYPT,
DECRYPT,
}
 
class Program {
const string L_ALPHABET = "HXUCZVAMDSLKPEFJRIGTWOBNYQ";
const string R_ALPHABET = "PTLNBQDEOYSFAVZKGJRIHWXUMC";
 
static string Exec(string text, Mode mode, bool showSteps = false) {
char[] left = L_ALPHABET.ToCharArray();
char[] right = R_ALPHABET.ToCharArray();
char[] eText = new char[text.Length];
char[] temp = new char[26];
 
for (int i = 0; i < text.Length; ++i) {
if (showSteps) Console.WriteLine("{0} {1}", string.Join("", left), string.Join("", right));
int index = 0;
if (mode == Mode.ENCRYPT) {
index = Array.IndexOf(right, text[i]);
eText[i] = left[index];
} else {
index = Array.IndexOf(left, text[i]);
eText[i] = right[index];
}
if (i == text.Length - 1) break;
 
// permute left
 
for (int j = index; j < 26; ++j) temp[j - index] = left[j];
for (int j = 0; j < index; ++j) temp[26 - index + j] = left[j];
var store = temp[1];
for (int j = 2; j < 14; ++j) temp[j - 1] = temp[j];
temp[13] = store;
temp.CopyTo(left, 0);
 
// permute right
 
for (int j = index; j < 26; ++j) temp[j - index] = right[j];
for (int j = 0; j < index; ++j) temp[26 - index + j] = right[j];
store = temp[0];
for (int j = 1; j < 26; ++j) temp[j - 1] = temp[j];
temp[25] = store;
store = temp[2];
for (int j = 3; j < 14; ++j) temp[j - 1] = temp[j];
temp[13] = store;
temp.CopyTo(right, 0);
}
 
return new string(eText);
}
 
static void Main(string[] args) {
var plainText = "WELLDONEISBETTERTHANWELLSAID";
Console.WriteLine("The original plaintext is : {0}", plainText);
Console.WriteLine("\nThe left and right alphabets after each permutation during encryption are :\n");
var cipherText = Exec(plainText, Mode.ENCRYPT, true);
Console.WriteLine("\nThe ciphertext is : {0}", cipherText);
var plainText2 = Exec(cipherText, Mode.DECRYPT);
Console.WriteLine("\nThe recovered plaintext is : {0}", plainText2);
}
}
}
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are :

HXUCZVAMDSLKPEFJRIGTWOBNYQ PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF OBMESWKYZXUCPRTLNHFAGVQDJI

The ciphertext is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

C++[edit]

Translation of: C#
#include <iostream>
 
enum class Mode {
ENCRYPT,
DECRYPT,
};
 
const std::string L_ALPHABET = "HXUCZVAMDSLKPEFJRIGTWOBNYQ";
const std::string R_ALPHABET = "PTLNBQDEOYSFAVZKGJRIHWXUMC";
 
std::string exec(std::string text, Mode mode, bool showSteps = false) {
auto left = L_ALPHABET;
auto right = R_ALPHABET;
auto eText = new char[text.size() + 1];
auto temp = new char[27];
 
memset(eText, 0, text.size() + 1);
memset(temp, 0, 27);
 
for (size_t i = 0; i < text.size(); i++) {
if (showSteps) std::cout << left << ' ' << right << '\n';
size_t index;
if (mode == Mode::ENCRYPT) {
index = right.find(text[i]);
eText[i] = left[index];
} else {
index = left.find(text[i]);
eText[i] = right[index];
}
if (i == text.size() - 1) break;
 
// permute left
 
for (int j = index; j < 26; ++j) temp[j - index] = left[j];
for (int j = 0; j < index; ++j) temp[26 - index + j] = left[j];
auto store = temp[1];
for (int j = 2; j < 14; ++j) temp[j - 1] = temp[j];
temp[13] = store;
left = temp;
 
// permurte right
 
for (int j = index; j < 26; ++j) temp[j - index] = right[j];
for (int j = 0; j < index; ++j) temp[26 - index + j] = right[j];
store = temp[0];
for (int j = 1; j < 26; ++j) temp[j - 1] = temp[j];
temp[25] = store;
store = temp[2];
for (int j = 3; j < 14; ++j) temp[j - 1] = temp[j];
temp[13] = store;
right = temp;
}
 
return eText;
}
 
int main() {
auto plainText = "WELLDONEISBETTERTHANWELLSAID";
std::cout << "The original plaintext is : " << plainText << "\n\n";
std::cout << "The left and right alphabets after each permutation during encryption are :\n";
auto cipherText = exec(plainText, Mode::ENCRYPT, true);
std::cout << "\nThe ciphertext is : " << cipherText << '\n';
auto plainText2 = exec(cipherText, Mode::DECRYPT);
std::cout << "\nThe recovered plaintext is : " << plainText2 << '\n';
 
return 0;
}
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are :
HXUCZVAMDSLKPEFJRIGTWOBNYQ PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF OBMESWKYZXUCPRTLNHFAGVQDJI

The ciphertext is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

D[edit]

Translation of: Kotlin
import std.stdio;
import std.string;
 
immutable L_ALPHABET = "HXUCZVAMDSLKPEFJRIGTWOBNYQ";
immutable R_ALPHABET = "PTLNBQDEOYSFAVZKGJRIHWXUMC";
 
enum Mode {
ENCRYPT,
DECRYPT,
}
 
string exec(string text, Mode mode, bool showSteps = false) {
char[] left = L_ALPHABET.dup;
char[] right = R_ALPHABET.dup;
char[] eText;
eText.length = text.length;
char[26] temp;
 
foreach (i; 0..text.length) {
if (showSteps) writeln(left, ' ', right);
int index;
if (mode == Mode.ENCRYPT) {
index = right.indexOf(text[i]);
eText[i] = left[index];
} else {
index = left.indexOf(text[i]);
eText[i] = right[index];
}
if (i == text.length - 1) break;
 
// permute left
 
foreach (j; index..26) temp[j - index] = left[j];
foreach (j; 0..index) temp[26 - index + j] = left[j];
auto store = temp[1];
foreach (j; 2..14) temp[j - 1] = temp[j];
temp[13] = store;
left = temp.dup;
 
// permute right
 
foreach (j; index..26) temp[j - index] = right[j];
foreach (j; 0..index) temp[26 - index + j] = right[j];
store = temp[0];
foreach (j; 1..26) temp[j - 1] = temp[j];
temp[25] = store;
store = temp[2];
foreach (j; 3..14) temp[j - 1] = temp[j];
temp[13] = store;
right = temp.dup;
}
 
return eText.idup;
}
 
void main() {
auto plainText = "WELLDONEISBETTERTHANWELLSAID";
writeln("The original plaintext is : ", plainText);
writeln("\nThe left and right alphabets after each permutation during encryption are :\n");
auto cipherText = exec(plainText, Mode.ENCRYPT, true);
writeln("\nThe ciphertext is : ", cipherText);
auto plainText2 = exec(cipherText, Mode.DECRYPT);
writeln("\nThe recovered plaintext is : ", plainText2);
}
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are :

HXUCZVAMDSLKPEFJRIGTWOBNYQ PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF OBMESWKYZXUCPRTLNHFAGVQDJI

The ciphertext is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

Delphi[edit]

Translation of: Kotlin
 
program Chaocipher;
 
{$APPTYPE CONSOLE}
 
uses
System.SysUtils;
 
type
TMode = (mcEncrypt, mcDecrypt);
 
const
lAlphabet = 'HXUCZVAMDSLKPEFJRIGTWOBNYQ';
rAlphabet = 'PTLNBQDEOYSFAVZKGJRIHWXUMC';
 
function Chao(text: AnsiString; Mode: TMode; showSteps: boolean): AnsiString;
begin
var len := Length(text);
 
var left: AnsiString := lAlphabet;
var right: AnsiString := rAlphabet;
 
var eText: AnsiString;
SetLength(eText, len);
var temp: AnsiString;
SetLength(temp, 26);
 
for var i := 0 to len - 1 do
begin
if showSteps then
writeln(left, ' ', right);
 
var index := 0;
 
if Mode = mcEncrypt then
begin
index := pos(text[i + 1], right) - 1;
eText[i + 1] := left[index + 1];
end
else
begin
index := pos(text[i + 1], left) - 1;
eText[i + 1] := right[index + 1];
end;
 
if i = len - 1 then
Break;
 
// premute left
for var j := index to 25 do
temp[j - index + 1] := left[j + 1];
 
for var j := 0 to index - 1 do
temp[27 - index + j] := left[j + 1];
var store := temp[2];
 
for var j := 2 to 13 do
temp[j] := temp[j + 1];
 
temp[14] := store;
 
left := temp;
 
// permute right
for var j := index to 25 do
temp[j - index + 1] := right[j + 1];
 
for var j := 0 to index - 1 do
temp[27 - index + j] := right[j + 1];
 
store := temp[0 + 1];
 
for var j := 1 to 25 do
temp[j] := temp[j + 1];
 
temp[26] := store;
store := temp[3];
 
for var j := 3 to 13 do
temp[j] := temp[j + 1];
 
temp[14] := store;
 
right := temp;
end;
Result := eText;
end;
 
begin
var plainText := 'WELLDONEISBETTERTHANWELLSAID';
writeln('The original plaintext is :', plainText);
write(#10'The left and right alphabets after each permutation ');
writeln('during encryption are :'#10);
var cipherText := Chao(plainText, mcEncrypt, true);
writeln(#10'The ciphertext is :', cipherText);
var plainText2 := Chao(cipherText, mcDecrypt, false);
writeln(#10'The recovered plaintext is : ', plainText2);
readln;
end.

F#[edit]

The Functions[edit]

 
// Implement Chaocipher. Nigel Galloway: July 13th., 2019
let pL n=function g when g=n->0 |g when g=(n+1)%26->13 |g->let x=(25+g-n)%26 in if x<13 then x else x+1
let pR n=function g when g=n->25 |g when g=(n+3)%26->13 |g when g=(n+1)%26->0 |g when g=(n+2)%26->1 |g->let x=(24+g-n)%26 in if x<13 then x else x+1
let encrypt lW rW txt=Array.scan(fun (lW,rW) t->let n=Array.findIndex(fun n->n=t) rW in ((Array.permute(pL n) lW,(Array.permute(pR n) rW))))(lW,rW) txt
|>Array.skip 1|>Array.map(fun(n,_)->n.[0])|>System.String
let decrypt lW rW txt=Array.scan(fun (_,lW,rW) t->let n=Array.findIndex(fun n->n=t) lW in ((Array.item n rW,Array.permute(pL n) lW,(Array.permute(pR n) rW))))('0',lW,rW) txt
|>Array.skip 1|>Array.map(fun(n,_,_)->n)|>System.String
 

The Task[edit]

 
printfn "%s" (encrypt ("HXUCZVAMDSLKPEFJRIGTWOBNYQ".ToCharArray()) ("PTLNBQDEOYSFAVZKGJRIHWXUMC".ToCharArray()) ("WELLDONEISBETTERTHANWELLSAID".ToCharArray()))
printfn "%s" (decrypt ("HXUCZVAMDSLKPEFJRIGTWOBNYQ".ToCharArray()) ("PTLNBQDEOYSFAVZKGJRIHWXUMC".ToCharArray()) ("OAHQHCNYNXTSZJRRHJBYHQKSOUJY".ToCharArray()))
 
Output:
OAHQHCNYNXTSZJRRHJBYHQKSOUJY
WELLDONEISBETTERTHANWELLSAID

Factor[edit]

USING: arrays combinators fry io kernel locals math namespaces
prettyprint sequences sequences.extras strings ;
IN: rosetta-code.chaocipher
 
CONSTANT: zenith 0
CONSTANT: nadir 13
 
SYMBOLS: l-alphabet r-alphabet last-index ;
 
: init-alphabets ( -- )
"HXUCZVAMDSLKPEFJRIGTWOBNYQ" l-alphabet
"PTLNBQDEOYSFAVZKGJRIHWXUMC" r-alphabet [ set ] [email protected] ;
 
: zero-alphabet ( seq -- seq' )
last-index get rotate ;
 
: 3append ( a b c d -- abcd )
append append append ;
 
:: permute-l-alphabet ( -- )
l-alphabet get zero-alphabet dup
zenith 1 + swap nth :> extracted-char
{
[ 1 head ]
[ nadir 1 + head 2 tail ]
[ drop extracted-char 1string ]
[ nadir 1 + tail ]
} cleave
3append l-alphabet set ;
 
:: permute-r-alphabet ( -- )
r-alphabet get zero-alphabet
1 rotate dup
zenith 2 + swap nth :> extracted-char
{
[ 2 head ]
[ nadir 1 + head 3 tail ]
[ drop extracted-char 1string ]
[ nadir 1 + tail ]
} cleave
3append r-alphabet set ;
 
: encipher-char ( char alpha1 alpha2 -- char' )
'[ _ get index dup last-index set _ get nth ] call ;
 
: encipher ( str quot -- str' )
[ permute-l-alphabet permute-r-alphabet ] compose map
init-alphabets ; inline
 
: encrypt ( str -- str' )
[ r-alphabet l-alphabet encipher-char ] encipher ;
 
: decrypt ( str -- str' )
[ l-alphabet r-alphabet encipher-char ] encipher ;
 
: main ( -- )
init-alphabets
"WELLDONEISBETTERTHANWELLSAID" encrypt dup decrypt
[ print ] [email protected] ;
 
MAIN: main
Output:
OAHQHCNYNXTSZJRRHJBYHQKSOUJY
WELLDONEISBETTERTHANWELLSAID

Fōrmulæ[edit]

Fōrmulæ programs are not textual, visualization/edition of programs is done showing/manipulating structures but not text. Moreover, there can be multiple visual representations of the same program. Even though it is possible to have textual representation —i.e. XML, JSON— they are intended for storage and transfer purposes more than visualization and edition.

Programs in Fōrmulæ are created/edited online in its website, However they run on execution servers. By default remote servers are used, but they are limited in memory and processing power, since they are intended for demonstration and casual use. A local server can be downloaded and installed, it has no limitations (it runs in your own computer). Because of that, example programs can be fully visualized and edited, but some of them will not run if they require a moderate or heavy computation/memory resources, and no local server is being used.

In this page you can see the program(s) related to this task and their results.

Go[edit]

Translation of: Kotlin
package main
 
import(
"fmt"
"strings"
"unicode/utf8"
)
 
type Mode int
 
const(
Encrypt Mode = iota
Decrypt
)
 
const(
lAlphabet = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
rAlphabet = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
)
 
func Chao(text string, mode Mode, showSteps bool) string {
len := len(text)
if utf8.RuneCountInString(text) != len {
fmt.Println("Text contains non-ASCII characters")
return ""
}
left := lAlphabet
right := rAlphabet
eText := make([]byte, len)
temp := make([]byte, 26)
 
for i := 0; i < len; i++ {
if showSteps {
fmt.Println(left, " ", right)
}
var index int
if mode == Encrypt {
index = strings.IndexByte(right, text[i])
eText[i] = left[index]
} else {
index = strings.IndexByte(left, text[i])
eText[i] = right[index]
}
if i == len - 1 {
break
}
 
// permute left
for j := index; j < 26; j++ {
temp[j - index] = left[j]
}
for j := 0; j < index; j++ {
temp[26 - index + j] = left[j]
}
store := temp[1]
for j := 2; j < 14; j++ {
temp[j - 1] = temp[j]
}
temp[13] = store
left = string(temp[:])
 
// permute right
 
for j := index; j < 26; j++ {
temp[j - index] = right[j]
}
for j := 0; j < index; j++ {
temp[26 - index + j] = right[j]
}
store = temp[0]
for j := 1; j < 26; j++ {
temp[j - 1] = temp[j]
}
temp[25] = store
store = temp[2]
for j := 3; j < 14; j++ {
temp[j - 1] = temp[j]
}
temp[13] = store
right = string(temp[:])
}
 
return string(eText[:])
}
 
func main() {
plainText := "WELLDONEISBETTERTHANWELLSAID"
fmt.Println("The original plaintext is :", plainText)
fmt.Print("\nThe left and right alphabets after each permutation ")
fmt.Println("during encryption are :\n")
cipherText := Chao(plainText, Encrypt, true)
fmt.Println("\nThe ciphertext is :", cipherText)
plainText2 := Chao(cipherText, Decrypt, false)
fmt.Println("\nThe recovered plaintext is :", plainText2)
}
Output:
Same as Kotlin entry.

Groovy[edit]

Translation of: Java
class Chaocipher {
private enum Mode {
ENCRYPT,
DECRYPT
}
 
private static final String L_ALPHABET = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
private static final String R_ALPHABET = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
 
private static int indexOf(char[] a, char c) {
for (int i = 0; i < a.length; ++i) {
if (a[i] == c) {
return i
}
}
return -1
}
 
private static String exec(String text, Mode mode) {
return exec(text, mode, false)
}
 
private static String exec(String text, Mode mode, Boolean showSteps) {
char[] left = L_ALPHABET.toCharArray()
char[] right = R_ALPHABET.toCharArray()
char[] eText = new char[text.length()]
char[] temp = new char[26]
 
for (int i = 0; i < text.length(); ++i) {
if (showSteps) {
println("${new String(left)} ${new String(right)}")
}
int index
if (mode == Mode.ENCRYPT) {
index = indexOf(right, text.charAt(i))
eText[i] = left[index]
} else {
index = indexOf(left, text.charAt(i))
eText[i] = right[index]
}
if (i == text.length() - 1) {
break
}
 
// permute left
 
if (26 - index >= 0) System.arraycopy(left, index, temp, 0, 26 - index)
System.arraycopy(left, 0, temp, 26 - index, index)
char store = temp[1]
System.arraycopy(temp, 2, temp, 1, 12)
temp[13] = store
left = Arrays.copyOf(temp, temp.length)
 
// permute right
 
if (26 - index >= 0) System.arraycopy(right, index, temp, 0, 26 - index)
System.arraycopy(right, 0, temp, 26 - index, index)
store = temp[0]
System.arraycopy(temp, 1, temp, 0, 25)
temp[25] = store
store = temp[2]
System.arraycopy(temp, 3, temp, 2, 11)
temp[13] = store
right = Arrays.copyOf(temp, temp.length)
}
 
return new String(eText)
}
 
static void main(String[] args) {
String plainText = "WELLDONEISBETTERTHANWELLSAID"
println("The original plaintext is : $plainText")
println("\nThe left and right alphabets after each permutation during encryption are:")
String cipherText = exec(plainText, Mode.ENCRYPT, true)
println("\nThe cipher text is : $cipherText")
String plainText2 = exec(cipherText, Mode.DECRYPT)
println("\nThe recovered plaintext is : $plainText2")
}
}
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are:
HXUCZVAMDSLKPEFJRIGTWOBNYQ  PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW  XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV  OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ  NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY  NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE  JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU  YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO  BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP  RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO  MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ  AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM  IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB  RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ  LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF  LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ  RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ  YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY  LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF  MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD  VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE  HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX  RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON  SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS  NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR  NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW  WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP  GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF  OBMESWKYZXUCPRTLNHFAGVQDJI

The cipher text is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

Haskell[edit]

import Data.List (elemIndex)
 
chao
:: Eq a
=> [a] -> [a] -> Bool -> [a] -> [a]
chao _ _ _ [] = []
chao l r plain (x:xs) = maybe [] go (elemIndex x src)
where
(src, dst)
| plain = (l, r)
| otherwise = (r, l)
go n =
dst !! n :
chao
(shifted 1 14 (rotated n l))
((shifted 2 14 . shifted 0 26) (rotated n r))
plain
xs
 
rotated :: Int -> [a] -> [a]
rotated n = take . length <*> drop n . cycle
 
shifted :: Int -> Int -> [a] -> [a]
shifted src dst s = concat [x, rotated 1 y, b]
where
(a, b) = splitAt dst s
(x, y) = splitAt src a
 
encode = False
 
decode = True
 
main :: IO ()
main = do
let chaoWheels =
chao "HXUCZVAMDSLKPEFJRIGTWOBNYQ" "PTLNBQDEOYSFAVZKGJRIHWXUMC"
plainText = "WELLDONEISBETTERTHANWELLSAID"
cipherText = chaoWheels encode plainText
print plainText
print cipherText
print $ chaoWheels decode cipherText
Output:
"WELLDONEISBETTERTHANWELLSAID"
"OAHQHCNYNXTSZJRRHJBYHQKSOUJY"
"WELLDONEISBETTERTHANWELLSAID"

Java[edit]

Translation of: Kotlin
import java.util.Arrays;
 
public class Chaocipher {
private enum Mode {
ENCRYPT,
DECRYPT
}
 
private static final String L_ALPHABET = "HXUCZVAMDSLKPEFJRIGTWOBNYQ";
private static final String R_ALPHABET = "PTLNBQDEOYSFAVZKGJRIHWXUMC";
 
private static int indexOf(char[] a, char c) {
for (int i = 0; i < a.length; ++i) {
if (a[i] == c) {
return i;
}
}
return -1;
}
 
private static String exec(String text, Mode mode) {
return exec(text, mode, false);
}
 
private static String exec(String text, Mode mode, Boolean showSteps) {
char[] left = L_ALPHABET.toCharArray();
char[] right = R_ALPHABET.toCharArray();
char[] eText = new char[text.length()];
char[] temp = new char[26];
 
for (int i = 0; i < text.length(); ++i) {
if (showSteps) {
System.out.printf("%s  %s\n", new String(left), new String(right));
}
int index;
if (mode == Mode.ENCRYPT) {
index = indexOf(right, text.charAt(i));
eText[i] = left[index];
} else {
index = indexOf(left, text.charAt(i));
eText[i] = right[index];
}
if (i == text.length() - 1) {
break;
}
 
// permute left
 
if (26 - index >= 0) System.arraycopy(left, index, temp, 0, 26 - index);
System.arraycopy(left, 0, temp, 26 - index, index);
char store = temp[1];
System.arraycopy(temp, 2, temp, 1, 12);
temp[13] = store;
left = Arrays.copyOf(temp, temp.length);
 
// permute right
 
if (26 - index >= 0) System.arraycopy(right, index, temp, 0, 26 - index);
System.arraycopy(right, 0, temp, 26 - index, index);
store = temp[0];
System.arraycopy(temp, 1, temp, 0, 25);
temp[25] = store;
store = temp[2];
System.arraycopy(temp, 3, temp, 2, 11);
temp[13] = store;
right = Arrays.copyOf(temp, temp.length);
}
 
return new String(eText);
}
 
public static void main(String[] args) {
String plainText = "WELLDONEISBETTERTHANWELLSAID";
System.out.printf("The original plaintext is : %s\n", plainText);
System.out.println("\nThe left and right alphabets after each permutation during encryption are:");
String cipherText = exec(plainText, Mode.ENCRYPT, true);
System.out.printf("\nThe cipher text is : %s\n", cipherText);
String plainText2 = exec(cipherText, Mode.DECRYPT);
System.out.printf("\nThe recovered plaintext is : %s\n", plainText2);
}
}
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are:
HXUCZVAMDSLKPEFJRIGTWOBNYQ  PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW  XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV  OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ  NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY  NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE  JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU  YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO  BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP  RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO  MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ  AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM  IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB  RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ  LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF  LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ  RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ  YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY  LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF  MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD  VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE  HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX  RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON  SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS  NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR  NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW  WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP  GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF  OBMESWKYZXUCPRTLNHFAGVQDJI

The cipher text is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

J[edit]

Translation of: Raku
reset =:  verb define
LEFT =: 'HXUCZVAMDSLKPEFJRIGTWOBNYQ'
RIGHT =: 'PTLNBQDEOYSFAVZKGJRIHWXUMC'
)
 
enc =: verb define
z =. LEFT {~ i =. RIGHT i. y
permute {. i
z
)
 
dec =: verb define
z =. RIGHT {~ i =. LEFT i. y
permute {. i
z
)
 
permute =: verb define
LEFT =: LEFT |.~ - y
LEFT =: (1 |. 13 {. LEFT) , 13 }. LEFT
 
RIGHT =: RIGHT |.~ - y + 1
RIGHT =: ({. RIGHT) , (1 |. RIGHT {~ 2+i.12) , 13 }. RIGHT
)
 
chao =: enc :. dec
 
reset ''
smoutput E =. chao 'WELLDONEISBETTERTHANWELLSAID'
reset ''
smoutput D =. chao^:_1 E
Output:
OMUUADCMTLZMXXMGXWPCOMUULPTA
WELLDONEISBETTERTHANWELLSAID

JavaScript[edit]

Translation of: C

Script source

const L_ALPHABET = "HXUCZVAMDSLKPEFJRIGTWOBNYQ";
const R_ALPHABET = "PTLNBQDEOYSFAVZKGJRIHWXUMC";
 
const ENCRYPT = 0;
const DECRYPT = 1;
 
function setCharAt(str, index, chr) {
if (index > str.length - 1) return str;
return str.substr(0, index) + chr + str.substr(index + 1);
}
 
function chao(text, mode, show_steps) {
var left = L_ALPHABET;
var right = R_ALPHABET;
var out = text;
var temp = "01234567890123456789012345";
var i = 0;
var index, j, store;
 
if (show_steps) {
console.log("The left and right alphabets after each permutation during encryption are :");
}
while (i < text.length) {
if (show_steps) {
console.log(left + " " + right);
}
if (mode == ENCRYPT) {
index = right.indexOf(text[i]);
out = setCharAt(out, i, left[index]);
} else {
index = left.indexOf(text[i]);
out = setCharAt(out, i, right[index]);
}
if (i == text.length - 1) {
break;
}
 
//permute left
j = index;
while (j < 26) {
temp = setCharAt(temp, j - index, left[j])
j += 1;
}
j = 0;
while (j < index) {
temp = setCharAt(temp, 26 - index + j, left[j]);
j += 1;
}
store = temp[1];
j = 2;
while (j < 14) {
temp = setCharAt(temp, j - 1, temp[j]);
j += 1;
}
temp = setCharAt(temp, 13, store);
left = temp;
 
//permute right
j = index;
while (j < 26) {
temp = setCharAt(temp, j - index, right[j]);
j += 1;
}
j = 0;
while (j < index) {
temp = setCharAt(temp, 26 - index + j, right[j]);
j += 1;
}
store = temp[0];
j = 1;
while (j < 26) {
temp = setCharAt(temp, j - 1, temp[j]);
j += 1;
}
temp = setCharAt(temp, 25, store);
store = temp[2];
j = 3;
while (j < 14) {
temp = setCharAt(temp, j - 1, temp[j]);
j += 1;
}
temp = setCharAt(temp, 13, store);
right = temp;
 
i += 1;
}
 
return out;
}
 
function main() {
var out = document.getElementById("content");
const plain_text = "WELLDONEISBETTERTHANWELLSAID";
 
out.innerHTML = "<p>The original plaintext is : " + plain_text + "</p>";
var cipher_text = chao(plain_text, ENCRYPT, true);
out.innerHTML += "<p>The ciphertext is : " + cipher_text + "</p>";
var decipher_text = chao(cipher_text, DECRYPT, false);
out.innerHTML += "<p>The recovered plaintext is : " + decipher_text + "</p>";
}

Solution page

<!DOCTYPE html>
<html>
<head>
<title>Chaocipher</title>
<script src="chaocipher.js"></script>
</head>
<body onload="main()">
<div id="content"></div>
</body>
</html>
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID
The ciphertext is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY
The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

Julia[edit]

Modified from the Kotlin and Raku entries.

const leftalphabet = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
const rightalphabet = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
 
function chacocoding(text, encoding, verbose=false)
left, right = Vector{Char}(leftalphabet), Vector{Char}(rightalphabet)
len, coded = length(text), similar(Vector{Char}(text))
for i in 1:len
verbose && println(String(left), " ", String(right))
n = indexin(text[i], encoding ? right : left)[1]
coded[i] = encoding ? left[n] : right[n]
if i < len
left .= circshift(left, -n + 1)
left[2:14] .= circshift(left[2:14], -1)
right .= circshift(right, -n)
right[3:14] .= circshift(right[3:14], -1)
end
end
String(coded)
end
 
function testchacocipher(txt)
println("The original plaintext is: $txt")
println("\nThe left and right alphabets for each character during encryption are:")
encoded = chacocoding(txt, true, true)
println("\nThe encoded ciphertext is: $encoded")
decoded = chacocoding(encoded, false)
println("\nDecoded, the recovered plaintext is: $decoded")
end
 
testchacocipher("WELLDONEISBETTERTHANWELLSAID")
 
Output:
The original plaintext is: WELLDONEISBETTERTHANWELLSAID

The left and right alphabets for each character during encryption are:
HXUCZVAMDSLKPEFJRIGTWOBNYQ   PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW   XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV   OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ   NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY   NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE   JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU   YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO   BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP   RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO   MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ   AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM   IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB   RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ   LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF   LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ   RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ   YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY   LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF   MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD   VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE   HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX   RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON   SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS   NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR   NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW   WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP   GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF   OBMESWKYZXUCPRTLNHFAGVQDJI

The encoded ciphertext is: OAHQHCNYNXTSZJRRHJBYHQKSOUJY

Decoded, the recovered plaintext is: WELLDONEISBETTERTHANWELLSAID

Kotlin[edit]

This is based on the C# implementation referred to in the task description, except that the encrypt and decrypt operations are combined into a single method.

// Version 1.2.40
 
enum class Mode { ENCRYPT, DECRYPT }
 
object Chao {
private val lAlphabet = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
private val rAlphabet = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
 
fun exec(text: String, mode: Mode, showSteps: Boolean = false): String {
var left = lAlphabet
var right = rAlphabet
val eText = CharArray(text.length)
val temp = CharArray(26)
 
for (i in 0 until text.length) {
if (showSteps) println("$left $right")
var index: Int
if (mode == Mode.ENCRYPT) {
index = right.indexOf(text[i])
eText[i] = left[index]
}
else {
index = left.indexOf(text[i])
eText[i] = right[index]
}
if (i == text.length - 1) break
 
// permute left
 
for (j in index..25) temp[j - index] = left[j]
for (j in 0 until index) temp[26 - index + j] = left[j]
var store = temp[1]
for (j in 2..13) temp[j - 1] = temp[j]
temp[13] = store
left = String(temp)
 
// permute right
 
for (j in index..25) temp[j - index] = right[j]
for (j in 0 until index) temp[26 - index + j] = right[j]
store = temp[0]
for (j in 1..25) temp[j - 1] = temp[j]
temp[25] = store
store = temp[2]
for (j in 3..13) temp[j - 1] = temp[j]
temp[13] = store
right = String(temp)
}
 
return String(eText)
}
}
 
fun main(args: Array<String>) {
val plainText = "WELLDONEISBETTERTHANWELLSAID"
println("The original plaintext is : $plainText")
println("\nThe left and right alphabets after each permutation" +
" during encryption are :\n")
val cipherText = Chao.exec(plainText, Mode.ENCRYPT, true)
println("\nThe ciphertext is : $cipherText")
val plainText2 = Chao.exec(cipherText, Mode.DECRYPT)
println("\nThe recovered plaintext is : $plainText2")
}
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are :

HXUCZVAMDSLKPEFJRIGTWOBNYQ  PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW  XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV  OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ  NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY  NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE  JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU  YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO  BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP  RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO  MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ  AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM  IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB  RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ  LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF  LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ  RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ  YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY  LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF  MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD  VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE  HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX  RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON  SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS  NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR  NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW  WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP  GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF  OBMESWKYZXUCPRTLNHFAGVQDJI

The ciphertext is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID


Lua[edit]

-- Chaocipher, in Lua, 6/19/2020 db
local Chaocipher = {
ct = "HXUCZVAMDSLKPEFJRIGTWOBNYQ",
pt = "PTLNBQDEOYSFAVZKGJRIHWXUMC",
encrypt = function(self, text) return self:_encdec(text, true) end,
decrypt = function(self, text) return self:_encdec(text, false) end,
_encdec = function(self, text, encflag)
local ct, pt, s = self.ct, self.pt, ""
local cshl = function(s,i) return s:sub(i) .. s:sub(1,i-1) end
local sshl = function(s,i) return s:sub(1,i-1) .. s:sub(i+1,14) .. s:sub(i,i) .. s:sub(15) end
for ch in text:gmatch(".") do
local i = (encflag and pt or ct):find(ch)
s = s .. (encflag and ct or pt):sub(i,i)
if encflag then print(ct, pt, ct:sub(i,i), pt:sub(i,i)) end
ct, pt = sshl(cshl(ct, i), 2), sshl(cshl(pt, i+1), 3)
end
return s
end,
}
local plainText = "WELLDONEISBETTERTHANWELLSAID"
local encryptText = Chaocipher:encrypt(plainText)
local decryptText = Chaocipher:decrypt(encryptText)
print()
print("The original text was: " .. plainText)
print("The encrypted text is: " .. encryptText)
print("The decrypted text is: " .. decryptText)
Output:
HXUCZVAMDSLKPEFJRIGTWOBNYQ      PTLNBQDEOYSFAVZKGJRIHWXUMC      O       W
ONYQHXUCZVAMDBSLKPEFJRIGTW      XUCPTLNBQDEOYMSFAVZKGJRIHW      A       E
ADBSLKPEFJRIGMTWONYQHXUCZV      OYSFAVZKGJRIHMWXUCPTLNBQDE      H       L
HUCZVADBSLKPEXFJRIGMTWONYQ      NBDEOYSFAVZKGQJRIHMWXUCPTL      Q       L
QUCZVADBSLKPEHXFJRIGMTWONY      NBEOYSFAVZKGQDJRIHMWXUCPTL      H       D
HFJRIGMTWONYQXUCZVADBSLKPE      JRHMWXUCPTLNBIEOYSFAVZKGQD      C       O
CVADBSLKPEHFJZRIGMTWONYQXU      YSAVZKGQDJRHMFWXUCPTLNBIEO      N       N
NQXUCVADBSLKPYEHFJZRIGMTWO      BIOYSAVZKGQDJERHMFWXUCPTLN      Y       E
YHFJZRIGMTWONEQXUCVADBSLKP      RHFWXUCPTLNBIMOYSAVZKGQDJE      N       I
NQXUCVADBSLKPEYHFJZRIGMTWO      MOSAVZKGQDJERYHFWXUCPTLNBI      X       S
XCVADBSLKPEYHUFJZRIGMTWONQ      AVKGQDJERYHFWZXUCPTLNBIMOS      T       B
TONQXCVADBSLKWPEYHUFJZRIGM      IMSAVKGQDJERYOHFWZXUCPTLNB      S       E
SKWPEYHUFJZRILGMTONQXCVADB      RYHFWZXUCPTLNOBIMSAVKGQDJE      Z       T
ZILGMTONQXCVARDBSKWPEYHUFJ      LNBIMSAVKGQDJOERYHFWZXUCPT      J       T
JILGMTONQXCVAZRDBSKWPEYHUF      LNIMSAVKGQDJOBERYHFWZXUCPT      R       E
RBSKWPEYHUFJIDLGMTONQXCVAZ      RYFWZXUCPTLNIHMSAVKGQDJOBE      R       R
RSKWPEYHUFJIDBLGMTONQXCVAZ      YFZXUCPTLNIHMWSAVKGQDJOBER      H       T
HFJIDBLGMTONQUXCVAZRSKWPEY      LNHMWSAVKGQDJIOBERYFZXUCPT      J       H
JDBLGMTONQUXCIVAZRSKWPEYHF      MWAVKGQDJIOBESRYFZXUCPTLNH      B       A
BGMTONQUXCIVALZRSKWPEYHFJD      VKQDJIOBESRYFGZXUCPTLNHMWA      Y       N
YFJDBGMTONQUXHCIVALZRSKWPE      HMAVKQDJIOBESWRYFGZXUCPTLN      H       W
HIVALZRSKWPEYCFJDBGMTONQUX      RYGZXUCPTLNHMFAVKQDJIOBESW      Q       E
QXHIVALZRSKWPUEYCFJDBGMTON      SWYGZXUCPTLNHRMFAVKQDJIOBE      K       L
KPUEYCFJDBGMTWONQXHIVALZRS      NHMFAVKQDJIOBRESWYGZXUCPTL      S       L
SPUEYCFJDBGMTKWONQXHIVALZR      NHFAVKQDJIOBRMESWYGZXUCPTL      O       S
OQXHIVALZRSPUNEYCFJDBGMTKW      WYZXUCPTLNHFAGVKQDJIOBRMES      U       A
UEYCFJDBGMTKWNOQXHIVALZRSP      GVQDJIOBRMESWKYZXUCPTLNHFA      J       I
JBGMTKWNOQXHIDVALZRSPUEYCF      OBMESWKYZXUCPRTLNHFAGVQDJI      Y       D

The original text was:  WELLDONEISBETTERTHANWELLSAID
The encrypted text is:  OAHQHCNYNXTSZJRRHJBYHQKSOUJY
The decrypted text is:  WELLDONEISBETTERTHANWELLSAID


Mathematica/Wolfram Language[edit]

ClearAll[ichaoalphabet, iMoveToFront, ChaoCipher]
ichaoalphabet = CharacterRange["A", "Z"];
iMoveToFront[l_List, sel_] := Module[{p},
p = FirstPosition[l, sel];
RotateLeft[l, p - 1]
]
ChaoCipher::wrongcipheralpha =
"The cipher alphabet `1` is not a permutation of \
\"A\"\[LongDash]\"Z\".";
ChaoCipher::wrongplainalpha =
"The plain alphabet `1` is not a permutation of \"A\"\[LongDash]\"Z\
\".";
ChaoCipher[str_String, {plainalpha_List, cipheralpha_List}] :=
Module[{pa, ca, plain, new, papermute, capermute, out},
ca = ToUpperCase[cipheralpha];
pa = ToUpperCase[plainalpha];
If[Sort[ca] =!= Sort[ichaoalphabet],
Message[ChaoCipher::wrongcipheralpha, ca];
$Failed
,
If[Sort[pa] =!= Sort[ichaoalphabet],
Message[ChaoCipher::wrongplainalpha, pa];
$Failed
,
capermute = SubsetMap[RotateLeft, Range[26], Range[2, 14]];
papermute =
SubsetMap[RotateLeft, RotateLeft[Range[26], 1], Range[3, 14]];
plain =
Select[Characters[ToUpperCase[str]], MemberQ[ichaoalphabet, #] &];
 
out = Table[
new = Association[Thread[pa -> ca]][p];
pa = iMoveToFront[pa, p];
ca = iMoveToFront[ca, new];
pa = pa[[papermute]];
ca = ca[[capermute]];
new
,
{p, plain}
];
StringJoin[out]
]
]
]
ChaoCipher["WELLDONEISBETTERTHANWELLSAID",{[email protected]"PTLNBQDEOYSFAVZKGJRIHWXUMC",[email protected]"HXUCZVAMDSLKPEFJRIGTWOBNYQ"}]
 
Output:
OAHQHCNYNXTSZJRRHJBYHQKSOUJY

Nim[edit]

Translation of: Kotlin
import strformat
 
type
Mode = enum
Encrypt
Decrypt
 
const lAlphabet: string = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
const rAlphabet: string = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
 
proc chao(text: string, mode: Mode, verbose: bool = false): string =
var left = lAlphabet
var right = rAlphabet
var eText = newSeq[char](text.len)
var temp: array[26, char]
 
for i in 0..<text.len:
if verbose:
echo &"{left} {right}"
var index: int
if mode == Encrypt:
index = right.find(text[i])
eText[i] = left[index]
else:
index = left.find(text[i])
eText[i] = right[index]
if (i == text.len - 1):
break
 
# permute left
for j in index..25:
temp[j - index] = left[j]
for j in 0..<index:
temp[26 - index + j] = left[j]
var store = temp[1]
for j in 2..13:
temp[j - 1] = temp[j]
temp[13] = store
left = ""
for i in temp:
left &= $i
 
# permute right
for j in index..25:
temp[j - index] = right[j]
for j in 0..<index:
temp[26 - index + j] = right[j]
store = temp[0]
for j in 1..25:
temp[j - 1] = temp[j]
temp[25] = store
store = temp[2]
for j in 3..13:
temp[j - 1] = temp[j]
temp[13] = store
right = ""
for i in temp:
right &= $i
 
for i in eText:
result &= $i
 
var plainText = "WELLDONEISBETTERTHANWELLSAID"
echo &"The original plaintext is: {plainText}"
echo "\nThe left and right alphabets after each permutation during encryption are:\n"
var cipherText = chao(plainText, Encrypt, true)
echo &"\nThe ciphertext is: {cipherText}"
var plainText2 = chao(cipherText, Decrypt, false)
echo &"\nThe recovered plaintext is: {plainText2}"
Output:
The original plaintext is: WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are:

HXUCZVAMDSLKPEFJRIGTWOBNYQ  PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW  XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV  OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ  NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY  NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE  JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU  YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO  BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP  RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO  MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ  AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM  IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB  RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ  LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF  LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ  RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ  YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY  LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF  MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD  VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE  HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX  RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON  SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS  NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR  NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW  WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP  GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF  OBMESWKYZXUCPRTLNHFAGVQDJI

The ciphertext is: OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is: WELLDONEISBETTERTHANWELLSAID

Another implementation[edit]

Using functions from the stdlib instead of manual array manipulations:

import std/[algorithm, strutils]
 
type
Mode = enum
Encrypt
Decrypt
 
const
lAlphabet = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
rAlphabet = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
 
proc chao(text: string; mode: Mode; verbose = false): string =
var
left = lAlphabet
right = rAlphabet
eText = newSeq[char](text.len)
 
for i in 0 ..< text.len:
if verbose:
echo left, " ", right
var index: int
if mode == Encrypt:
index = right.find(text[i])
eText[i] = left[index]
else:
index = left.find(text[i])
eText[i] = right[index]
if i == text.len - 1:
break
 
# permute left
left.rotateLeft(index)
left.rotateLeft(1..13, 1)
 
# permute right
right.rotateLeft(index + 1)
right.rotateLeft(2..13, 1)
 
result = eText.join()
 
let plainText = "WELLDONEISBETTERTHANWELLSAID"
echo "The original plaintext is: ", plainText
echo "\nThe left and right alphabets after each permutation during encryption are:\n"
let cipherText = chao(plainText, Encrypt, true)
echo "\nThe ciphertext is: ", cipherText
let plainText2 = chao(cipherText, Decrypt, false)
echo "\nThe recovered plaintext is: ", plainText2

Same output as above.

Objeck[edit]

Translation of: Kotlin
class Chaocipher {
L_ALPHABET : static : Char[];
R_ALPHABET : static : Char[];
 
function : Main(args : String[]) ~ Nil {
L_ALPHABET := "HXUCZVAMDSLKPEFJRIGTWOBNYQ"->ToCharArray();
R_ALPHABET := "PTLNBQDEOYSFAVZKGJRIHWXUMC"->ToCharArray();
plainText := "WELLDONEISBETTERTHANWELLSAID"->ToCharArray();
 
System.IO.Console->Print("The original plaintext is: ")->PrintLine(plainText);
"\nThe left and right alphabets after each permutation during encryption are:\n"->PrintLine();
cipherText := Chao(plainText, Mode->ENCRYPT, true);
System.IO.Console->Print("\nThe ciphertext is: ")->PrintLine(cipherText);
plainText2 := Chao(cipherText, Mode->DECRYPT, false);
System.IO.Console->Print("The recovered plaintext is: ")->PrintLine(plainText2);
}
 
function : Chao(in : Char[], mode : Mode, show_steps : Bool) ~ Char[] {
i : Int; j : Int; index : Int;
store : Char;
len := in->Size();
left := Char->New[26]; right := Char->New[26]; temp := Char->New[26];
eText := Char->New[len];
 
Runtime->Copy(left, 0, L_ALPHABET, 0, L_ALPHABET->Size());
Runtime->Copy(right, 0, R_ALPHABET, 0, R_ALPHABET->Size());
 
for(i := 0; i < len; i += 1;) {
if (show_steps) {
System.IO.Console->Print(left)->Print(' ')->PrintLine(right);
};
if (mode = Mode->ENCRYPT) {
index := IndexOf(right, in[i]);
eText[i] := left[index];
}
else {
index := IndexOf(left, in[i]);
eText[i] := right[index];
};
 
if (i = len - 1) {
break;
};
 
# left
for(j := index; j < 26; j += 1;) { temp[j - index] := left[j]; };
for(j :=0; j < index; j += 1;) { temp[26 - index + j] := left[j]; };
store := temp[1];
for(j := 2; j < 14; j += 1;) { temp[j - 1] := temp[j]; };
temp[13] := store;
Runtime->Copy(left, 0, temp, 0, temp->Size());
 
# right
for(j := index; j < 26; j += 1;) { temp[j - index] := right[j]; };
for(j :=0; j < index; j += 1;) { temp[26 - index + j] := right[j]; };
store := temp[0];
for(j :=1; j < 26; j += 1;) { temp[j - 1] := temp[j]; };
temp[25] := store;
store := temp[2];
for(j := 3; j < 14; j += 1;) { temp[j - 1] := temp[j]; };
temp[13] := store;
Runtime->Copy(right, 0, temp, 0, temp->Size());
};
 
return eText;
}
 
function : IndexOf(str : Char[], c : Char) ~ Int {
for(i := 0; i < str->Size(); i += 1;) {
if(c = str[i]) {
return i;
};
};
 
return -1;
}
 
enum Mode { ENCRYPT, DECRYPT }
}
Output:
The original plaintext is: WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are:

HXUCZVAMDSLKPEFJRIGTWOBNYQ PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF OBMESWKYZXUCPRTLNHFAGVQDJI

The ciphertext is: OAHQHCNYNXTSZJRRHJBYHQKSOUJY
The recovered plaintext is: WELLDONEISBETTERTHANWELLSAID

Perl[edit]

Translation of: Raku

Since rotate is not a built-in in Perl, using a custom one, not general-purpose but sufficient for this task.

sub init {
@left = split '', 'HXUCZVAMDSLKPEFJRIGTWOBNYQ';
@right = split '', 'PTLNBQDEOYSFAVZKGJRIHWXUMC';
}
 
sub encode {
my($letter) = @_;
my $index = index join('', @right), $letter;
my $enc = $left[$index];
left_permute($index);
right_permute($index);
$enc
}
 
sub decode {
my($letter) = @_;
my $index = index join('', @left), $letter;
my $dec = $right[$index];
left_permute($index);
right_permute($index);
$dec
}
 
sub right_permute {
my($index) = @_;
rotate(\@right, $index + 1);
rotate(\@right, 1, 2, 13);
}
 
sub left_permute {
my($index) = @_;
rotate(\@left, $index);
rotate(\@left, 1, 1, 13);
}
 
sub rotate {
our @list; local *list = shift;
my($n,$s,$e) = @_;
@list = $s ? @list[0..$s-1, $s+$n..$e+$n-1, $s..$s+$n-1, $e+1..$#list]
: @list[$n..$#list, 0..$n-1]
}
 
init; $e_msg .= encode($_) for split '', 'WELLDONEISBETTERTHANWELLSAID';
init; $d_msg .= decode($_) for split '', $e_msg;
 
print "$e_msg\n";
print "$d_msg\n";
Output:
OAHQHCNYNXTSZJRRHJBYHQKSOUJY
WELLDONEISBETTERTHANWELLSAID

Phix[edit]

Originally translated from C, but ended up more of a direct implementation of the algorithm in the pdf.

-- demo\rosetta\Chao_cipher.exw
constant l_alphabet = "HXUCZVAMDSLKPEFJRIGTWOBNYQ",
r_alphabet = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
 
enum ENCRYPT, DECRYPT
 
function chao_cipher(string in, integer mode, bool show_steps)
integer len = length(in)
string out = repeat(' ',len)
string left = l_alphabet,
right = r_alphabet
for i=1 to len do
if show_steps then printf(1,"%s  %s\n", {left, right}) end if
integer index = find(in[i],iff(mode==ENCRYPT?right:left))
out[i] = iff(mode==ENCRYPT?left:right)[index]
 
if i==len then exit end if
 
/* permute left */
left = left[index..26]&left[1..index-1]
left[2..14] = left[3..14]&left[2]
 
/* permute right */
right = right[index+1..26]&right[1..index]
right[3..14] = right[4..14]&right[3]
end for
return out
end function
 
string plain_text = "WELLDONEISBETTERTHANWELLSAID"
printf(1,"The original plaintext is : %s\n", {plain_text})
 
--printf(1,"\nThe left and right alphabets after each permutation"&
-- " during encryption are :\n\n")
--string cipher_text = chao_cipher(plain_text, ENCRYPT, true)
string cipher_text = chao_cipher(plain_text, ENCRYPT, false)
printf(1,"\nThe ciphertext is : %s\n", {cipher_text})
 
string plain_text2 = chao_cipher(cipher_text, DECRYPT, false)
printf(1,"\nThe recovered plaintext is : %s\n", {plain_text2})
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The ciphertext is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

Python[edit]

Procedural[edit]

# Python3 implementation of Chaocipher 
# left wheel = ciphertext wheel
# right wheel = plaintext wheel
 
def main():
# letters only! makealpha(key) helps generate lalpha/ralpha.
lalpha = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
ralpha = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
msg = "WELLDONEISBETTERTHANWELLSAID"
 
print("L:", lalpha)
print("R:", ralpha)
print("I:", msg)
print("O:", do_chao(msg, lalpha, ralpha, 1, 0), "\n")
 
do_chao(msg, lalpha, ralpha, 1, 1)
 
def do_chao(msg, lalpha, ralpha, en=1, show=0):
msg = correct_case(msg)
out = ""
if show:
print("="*54)
print(10*" " + "left:" + 21*" " + "right: ")
print("="*54)
print(lalpha, ralpha, "\n")
for L in msg:
if en:
lalpha, ralpha = rotate_wheels(lalpha, ralpha, L)
out += lalpha[0]
else:
ralpha, lalpha = rotate_wheels(ralpha, lalpha, L)
out += ralpha[0]
lalpha, ralpha = scramble_wheels(lalpha, ralpha)
if show:
print(lalpha, ralpha)
return out
 
def makealpha(key=""):
alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
z = set()
key = [x.upper() for x in (key + alpha[::-1])
if not (x.upper() in z or z.add(x.upper()))]
return "".join(key)
 
def correct_case(string):
return "".join([s.upper() for s in string if s.isalpha()])
 
def permu(alp, num):
alp = alp[:num], alp[num:]
return "".join(alp[::-1])
 
def rotate_wheels(lalph, ralph, key):
newin = ralph.index(key)
return permu(lalph, newin), permu(ralph, newin)
 
def scramble_wheels(lalph, ralph):
# LEFT = cipher wheel
# Cycle second[1] through nadir[14] forward
lalph = list(lalph)
lalph = "".join([*lalph[0],
*lalph[2:14],
lalph[1],
*lalph[14:]])
 
# RIGHT = plain wheel
# Send the zenith[0] character to the end[25],
# cycle third[2] through nadir[14] characters forward
ralph = list(ralph)
ralph = "".join([*ralph[1:3],
*ralph[4:15],
ralph[3],
*ralph[15:],
ralph[0]])
return lalph, ralph
 
main()
L: HXUCZVAMDSLKPEFJRIGTWOBNYQ
R: PTLNBQDEOYSFAVZKGJRIHWXUMC
I: WELLDONEISBETTERTHANWELLSAID
O: OAHQHCNYNXTSZJRRHJBYHQKSOUJY 

======================================================
          left:                     right: 
======================================================
HXUCZVAMDSLKPEFJRIGTWOBNYQ PTLNBQDEOYSFAVZKGJRIHWXUMC 

ONYQHXUCZVAMDBSLKPEFJRIGTW XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF OBMESWKYZXUCPRTLNHFAGVQDJI
YFJBGMTKWNOQXCHIDVALZRSPUE JIBMESWKYZXUCOPRTLNHFAGVQD

OAHQHCNYNXTSZJRRHJBYHQKSOUJY
WELLDONEISBETTERTHANWELLSAID

Functional[edit]

Translation of: Haskell
Works with: Python version 3.7
'''Chaocipher'''
 
from itertools import chain, cycle, islice
 
 
# chao :: String -> String -> Bool -> String -> String
def chao(l):
'''Chaocipher encoding or decoding for the given
left and right 'wheels'.
A ciphertext is returned if the boolean flag
is True, and a plaintext if the flag is False.
'''

def go(l, r, plain, xxs):
if xxs:
(src, dst) = (l, r) if plain else (r, l)
(x, xs) = (xxs[0], xxs[1:])
 
def chaoProcess(n):
return [dst[n]] + go(
shifted(1)(14)(rotated(n, l)),
compose(shifted(2)(14))(shifted(0)(26))(
rotated(n, r)
),
plain,
xs
)
 
return maybe('')(chaoProcess)(
elemIndex(x)(src)
)
else:
return []
return lambda r: lambda plain: lambda xxs: concat(go(
l, r, plain, xxs
))
 
 
# rotated :: Int -> [a] -> [a]
def rotated(z, s):
'''Rotation of string s by z characters.'''
return take(len(s))(
drop(z)(
cycle(s)
)
)
 
 
# shifted :: Int -> Int -> [a] -> [a]
def shifted(src):
'''The string s with a set of its characters cyclically
shifted from a source index to a destination index.
'''

def go(dst, s):
(a, b) = splitAt(dst)(s)
(x, y) = splitAt(src)(a)
return concat([x, rotated(1, y), b])
return lambda dst: lambda s: go(dst, s)
 
 
# TEST ----------------------------------------------------
# main :: IO ()
def main():
'''Print the plain text, followed by
a corresponding cipher text,
and a decode of that cipher text.
'''

chaoWheels = chao(
"HXUCZVAMDSLKPEFJRIGTWOBNYQ"
)(
"PTLNBQDEOYSFAVZKGJRIHWXUMC"
)
plainText = "WELLDONEISBETTERTHANWELLSAID"
cipherText = chaoWheels(False)(plainText)
 
print(plainText)
print(cipherText)
print(
chaoWheels(True)(cipherText)
)
 
 
# GENERIC -------------------------------------------------
 
# Just :: a -> Maybe a
def Just(x):
'''Constructor for an inhabited Maybe (option type) value.
Wrapper containing the result of a computation.
'''

return {'type': 'Maybe', 'Nothing': False, 'Just': x}
 
 
# Nothing :: Maybe a
def Nothing():
'''Constructor for an empty Maybe (option type) value.
Empty wrapper returned where a computation is not possible.
'''

return {'type': 'Maybe', 'Nothing': True}
 
 
# compose (<<<) :: (b -> c) -> (a -> b) -> a -> c
def compose(g):
'''Right to left function composition.'''
return lambda f: lambda x: g(f(x))
 
 
# concat :: [[a]] -> [a]
# concat :: [String] -> String
def concat(xs):
'''The concatenation of all the elements
in a list or iterable.
'''

def f(ys):
zs = list(chain(*ys))
return ''.join(zs) if isinstance(ys[0], str) else zs
 
return (
f(xs) if isinstance(xs, list) else (
chain.from_iterable(xs)
)
) if xs else []
 
 
# drop :: Int -> [a] -> [a]
# drop :: Int -> String -> String
def drop(n):
'''The sublist of xs beginning at
(zero-based) index n.
'''

def go(xs):
if isinstance(xs, (list, tuple, str)):
return xs[n:]
else:
take(n)(xs)
return xs
return lambda xs: go(xs)
 
 
# elemIndex :: Eq a => a -> [a] -> Maybe Int
def elemIndex(x):
'''Just the index of the first element in xs
which is equal to x,
or Nothing if there is no such element.
'''

def go(xs):
try:
return Just(xs.index(x))
except ValueError:
return Nothing()
return lambda xs: go(xs)
 
 
# maybe :: b -> (a -> b) -> Maybe a -> b
def maybe(v):
'''Either the default value v, if m is Nothing,
or the application of f to x,
where m is Just(x).
'''

return lambda f: lambda m: v if None is m or m.get('Nothing') else (
f(m.get('Just'))
)
 
 
# splitAt :: Int -> [a] -> ([a], [a])
def splitAt(n):
'''A tuple pairing the prefix of length n
with the rest of xs.
'''

return lambda xs: (xs[0:n], xs[n:])
 
 
# take :: Int -> [a] -> [a]
# take :: Int -> String -> String
def take(n):
'''The prefix of xs of length n,
or xs itself if n > length xs.
'''

return lambda xs: (
xs[0:n]
if isinstance(xs, (list, tuple))
else list(islice(xs, n))
)
 
 
# MAIN ---
if __name__ == '__main__':
main()
Output:
WELLDONEISBETTERTHANWELLSAID
OAHQHCNYNXTSZJRRHJBYHQKSOUJY
WELLDONEISBETTERTHANWELLSAID

Raku[edit]

(formerly Perl 6)

Works with: Rakudo version 2018.03
my @left;
my @right;
 
sub reset {
@left = <HXUCZVAMDSLKPEFJRIGTWOBNYQ>.comb;
@right = <PTLNBQDEOYSFAVZKGJRIHWXUMC>.comb;
}
 
sub encode ($letter) {
my $index = @right.first: $letter.uc, :k;
my $enc = @left[$index];
$index.&permute;
$enc
}
 
sub decode ($letter) {
my $index = @left.first: $letter.uc, :k;
my $dec = @right[$index];
$index.&permute;
$dec
}
 
sub permute ($index) {
@left.=rotate: $index;
@left[1..13].=rotate;
@right.=rotate: $index + 1;
@right[2..13].=rotate;
}
 
reset;
say 'WELLDONEISBETTERTHANWELLSAID'.comb».&encode.join;
reset;
say 'OAHQHCNYNXTSZJRRHJBYHQKSOUJY'.comb».&decode.join;
Output:
OAHQHCNYNXTSZJRRHJBYHQKSOUJY
WELLDONEISBETTERTHANWELLSAID

Ruby[edit]

txt    = "WELLDONEISBETTERTHANWELLSAID"
@left = "HXUCZVAMDSLKPEFJRIGTWOBNYQ".chars
@right = "PTLNBQDEOYSFAVZKGJRIHWXUMC".chars
 
def encrypt(char)
coded_char = @left[@right.index(char)]
 
@left.rotate!(@left.index(coded_char))
part = @left.slice!(1,13).rotate
@left.insert(1, *part)
 
@right.rotate!(@right.index(char)+1)
part = @right.slice!(2,12).rotate
@right.insert(2, *part)
 
@left[0]
end
 
puts txt.each_char.map{|c| encrypt(c) }.join
 
Output:
OAHQHCNYNXTSZJRRHJBYHQKSOUJY

Rust[edit]

const LEFT_ALPHABET_CT: &str = "HXUCZVAMDSLKPEFJRIGTWOBNYQ";
const RIGHT_ALPHABET_PT: &str = "PTLNBQDEOYSFAVZKGJRIHWXUMC";
const ZENITH: usize = 0;
const NADIR: usize = 12;
const SEQUENCE: &str = "WELLDONEISBETTERTHANWELLSAID";
 
fn cipher(letter: &char, left: &String, right: &String) -> (usize, char) {
let pos = right.find(*letter).unwrap();
let cipher = left.chars().nth(pos).unwrap();
(pos, cipher)
}
 
fn main() {
let mut left = LEFT_ALPHABET_CT.to_string();
let mut right = RIGHT_ALPHABET_PT.to_string();
 
let ciphertext = SEQUENCE.chars()
.map(|letter| {
let (pos, cipher_char) = cipher(&letter, &left, &right);
left = format!("{}{}", &left[pos..], &left[..pos]);
left = format!("{}{}{}{}", &left[ZENITH..1], &left[2..NADIR+2], &left[1..2], &left[NADIR+2..]);
if pos != right.len() - 1 {
right = format!("{}{}", &right[pos + 1..], &right[..pos + 1]);
}
right = format!("{}{}{}{}", &right[ZENITH..2], &right[3..NADIR+2], &right[2..3], &right[NADIR+2..]);
cipher_char
})
.collect::<String>();
 
println!("Plaintext: {}", SEQUENCE);
println!("Ciphertext: {}", ciphertext);
}
Output:
Plaintext: WELLDONEISBETTERTHANWELLSAID
Ciphertext: OAHQHCNYNXTSZJRRHJBYHQKSOUJY

Tailspin[edit]

 
templates chaocipher&{left:,right:,decode:}
templates permute
def ctshift: [ [email protected]($..last)..., [email protected](1..$-1)...];
def p1: $ mod 26 + 1;
def ptshift: [ [email protected]($p1..last)..., [email protected](1..$p1-1)...];
..|@chaocipher: { ct: [ $ctshift(1), $ctshift(3..14)..., $ctshift(2), $ctshift(15..last)...],
pt: [ $ptshift(1..2)..., $ptshift(4..14)..., $ptshift(3), $ptshift(15..last)...] };
end permute
 
@: {ct:[ $left... ], pt: [ $right... ], result:[]};
$... -> #
'[email protected];' !
 
when <?($decode <=0>)> do
def plain: $;
def index: [email protected] -> \[i](<=$plain> $i!\) -> $(1);
..|@.result: [email protected]($index);
$index -> permute -> !VOID
otherwise
def cipher: $;
def index: [email protected] -> \[i](<=$cipher> $i!\) -> $(1);
..|@.result: [email protected]($index);
$index -> permute -> !VOID
end chaocipher
 
'WELLDONEISBETTERTHANWELLSAID' -> chaocipher&{left:'HXUCZVAMDSLKPEFJRIGTWOBNYQ', right:'PTLNBQDEOYSFAVZKGJRIHWXUMC',decode:0} -> '$;
' -> !OUT::write
 
'OAHQHCNYNXTSZJRRHJBYHQKSOUJY' -> chaocipher&{left:'HXUCZVAMDSLKPEFJRIGTWOBNYQ', right:'PTLNBQDEOYSFAVZKGJRIHWXUMC',decode:1} -> '$;
' -> !OUT::write
 
Output:
OAHQHCNYNXTSZJRRHJBYHQKSOUJY
WELLDONEISBETTERTHANWELLSAID

Visual Basic .NET[edit]

Translation of: C#
Module Module1
 
ReadOnly L_ALPHABET As String = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
ReadOnly R_ALPHABET As String = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
 
Enum Mode
ENCRYPT
DECRYPT
End Enum
 
Function Exec(text As String, mode As Mode, Optional showSteps As Boolean = False) As String
Dim left = L_ALPHABET.ToCharArray()
Dim right = R_ALPHABET.ToCharArray()
Dim eText(text.Length - 1) As Char
Dim temp(25) As Char
 
For i = 0 To text.Length - 1
If showSteps Then Console.WriteLine("{0} {1}", String.Join("", left), String.Join("", right))
Dim index As Integer
If mode = Mode.ENCRYPT Then
index = Array.IndexOf(right, text(i))
eText(i) = left(index)
Else
index = Array.IndexOf(left, text(i))
eText(i) = right(index)
End If
If i = text.Length - 1 Then Exit For
 
'permute left
 
For j = index To 25
temp(j - index) = left(j)
Next
For j = 0 To index - 1
temp(26 - index + j) = left(j)
Next
Dim store = temp(1)
For j = 2 To 13
temp(j - 1) = temp(j)
Next
temp(13) = store
temp.CopyTo(left, 0)
 
'permute right
 
For j = index To 25
temp(j - index) = right(j)
Next
For j = 0 To index - 1
temp(26 - index + j) = right(j)
Next
store = temp(0)
For j = 1 To 25
temp(j - 1) = temp(j)
Next
temp(25) = store
store = temp(2)
For j = 3 To 13
temp(j - 1) = temp(j)
Next
temp(13) = store
temp.CopyTo(right, 0)
Next
 
Return eText
End Function
 
Sub Main()
Dim plainText = "WELLDONEISBETTERTHANWELLSAID"
Console.WriteLine("The original plaintext is : {0}", plainText)
Console.WriteLine(vbNewLine + "The left and right alphabets after each permutation during encryption are :" + vbNewLine)
Dim cipherText = Exec(plainText, Mode.ENCRYPT, True)
Console.WriteLine(vbNewLine + "The ciphertext is : {0}", cipherText)
Dim plainText2 = Exec(cipherText, Mode.DECRYPT)
Console.WriteLine(vbNewLine + "The recovered plaintext is : {0}", plainText2)
End Sub
 
End Module
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are :

HXUCZVAMDSLKPEFJRIGTWOBNYQ PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF OBMESWKYZXUCPRTLNHFAGVQDJI

The ciphertext is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

Wren[edit]

Translation of: Kotlin
class Chao {
static encrypt { 0 }
static decrypt { 1 }
 
static exec(text, mode, showSteps) {
var len = text.count
if (len != text.bytes.count) Fiber.abort("Text contains non-ASCII characters.")
var left = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
var right = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
var eText = List.filled(len, "")
var temp = List.filled(26, "")
for (i in 0...len) {
if (showSteps) System.print("%(left)  %(right)")
var index
if (mode == Chao.encrypt) {
index = right.indexOf(text[i])
eText[i] = left[index]
} else {
index = left.indexOf(text[i])
eText[i] = right[index]
}
if (i == len - 1) break
 
// permute left
for (j in index..25) temp[j-index] = left[j]
for (j in 0...index) temp[26-index+j] = left[j]
var store = temp[1]
for (j in 2..13) temp[j-1] = temp[j]
temp[13] = store
left = temp.join()
 
// permute right
for (j in index..25) temp[j-index] = right[j]
for (j in 0...index) temp[26-index+j] = right[j]
store = temp[0]
for (j in 1..25) temp[j-1] = temp[j]
temp[25] = store
store = temp[2]
for (j in 3..13) temp[j-1] = temp[j]
temp[13] = store
right = temp.join()
}
return eText.join()
}
}
 
var plainText = "WELLDONEISBETTERTHANWELLSAID"
System.print("The original plaintext is : %(plainText)")
System.write("\nThe left and right alphabets after each permutation ")
System.print("during encryption are :\n")
var cipherText = Chao.exec(plainText, Chao.encrypt, true)
System.print("\nThe ciphertext is : %(cipherText)")
var plainText2 = Chao.exec(cipherText, Chao.decrypt, false)
System.print("\nThe recovered plaintext is : %(plainText2)")
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are :

HXUCZVAMDSLKPEFJRIGTWOBNYQ  PTLNBQDEOYSFAVZKGJRIHWXUMC
ONYQHXUCZVAMDBSLKPEFJRIGTW  XUCPTLNBQDEOYMSFAVZKGJRIHW
ADBSLKPEFJRIGMTWONYQHXUCZV  OYSFAVZKGJRIHMWXUCPTLNBQDE
HUCZVADBSLKPEXFJRIGMTWONYQ  NBDEOYSFAVZKGQJRIHMWXUCPTL
QUCZVADBSLKPEHXFJRIGMTWONY  NBEOYSFAVZKGQDJRIHMWXUCPTL
HFJRIGMTWONYQXUCZVADBSLKPE  JRHMWXUCPTLNBIEOYSFAVZKGQD
CVADBSLKPEHFJZRIGMTWONYQXU  YSAVZKGQDJRHMFWXUCPTLNBIEO
NQXUCVADBSLKPYEHFJZRIGMTWO  BIOYSAVZKGQDJERHMFWXUCPTLN
YHFJZRIGMTWONEQXUCVADBSLKP  RHFWXUCPTLNBIMOYSAVZKGQDJE
NQXUCVADBSLKPEYHFJZRIGMTWO  MOSAVZKGQDJERYHFWXUCPTLNBI
XCVADBSLKPEYHUFJZRIGMTWONQ  AVKGQDJERYHFWZXUCPTLNBIMOS
TONQXCVADBSLKWPEYHUFJZRIGM  IMSAVKGQDJERYOHFWZXUCPTLNB
SKWPEYHUFJZRILGMTONQXCVADB  RYHFWZXUCPTLNOBIMSAVKGQDJE
ZILGMTONQXCVARDBSKWPEYHUFJ  LNBIMSAVKGQDJOERYHFWZXUCPT
JILGMTONQXCVAZRDBSKWPEYHUF  LNIMSAVKGQDJOBERYHFWZXUCPT
RBSKWPEYHUFJIDLGMTONQXCVAZ  RYFWZXUCPTLNIHMSAVKGQDJOBE
RSKWPEYHUFJIDBLGMTONQXCVAZ  YFZXUCPTLNIHMWSAVKGQDJOBER
HFJIDBLGMTONQUXCVAZRSKWPEY  LNHMWSAVKGQDJIOBERYFZXUCPT
JDBLGMTONQUXCIVAZRSKWPEYHF  MWAVKGQDJIOBESRYFZXUCPTLNH
BGMTONQUXCIVALZRSKWPEYHFJD  VKQDJIOBESRYFGZXUCPTLNHMWA
YFJDBGMTONQUXHCIVALZRSKWPE  HMAVKQDJIOBESWRYFGZXUCPTLN
HIVALZRSKWPEYCFJDBGMTONQUX  RYGZXUCPTLNHMFAVKQDJIOBESW
QXHIVALZRSKWPUEYCFJDBGMTON  SWYGZXUCPTLNHRMFAVKQDJIOBE
KPUEYCFJDBGMTWONQXHIVALZRS  NHMFAVKQDJIOBRESWYGZXUCPTL
SPUEYCFJDBGMTKWONQXHIVALZR  NHFAVKQDJIOBRMESWYGZXUCPTL
OQXHIVALZRSPUNEYCFJDBGMTKW  WYZXUCPTLNHFAGVKQDJIOBRMES
UEYCFJDBGMTKWNOQXHIVALZRSP  GVQDJIOBRMESWKYZXUCPTLNHFA
JBGMTKWNOQXHIDVALZRSPUEYCF  OBMESWKYZXUCPRTLNHFAGVQDJI

The ciphertext is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID

zkl[edit]

Translation of: Raku
class Chao{
var [const private] lAlphabet = "HXUCZVAMDSLKPEFJRIGTWOBNYQ",
rAlphabet = "PTLNBQDEOYSFAVZKGJRIHWXUMC";
fcn encode(text){ code(text,encodeL); }
fcn decode(text){ code(text,decodeL); }
// reset alphabets each [en|de]code and maintain re-entrancy
fcn code(text,f){ text.apply(f,Data(Void,lAlphabet),Data(Void,rAlphabet)) }
fcn [private] encodeL(letter,left,right){ // encode a letter
index:=right.index(letter);
enc  :=left[index].toChar();
permute(left,right,index);
println(left.text," ",right.text," ",index);
enc
}
fcn [private] decodeL(letter,left,right){ // decode a letter
index:=left.index(letter);
dec  :=right[index].toChar();
permute(left,right,index);
dec
}
fcn [private] permute(left,right,index){
left.append(left.pop(0,index)); // rotate index times
left.insert(13,left.pop(1)); // rotate [1..13] once
 
right.append(right.pop(0,index+1)); # rotate index+1 times, idx==25==noop
right.insert(13,right.pop(2)); // rotate [2..13] once
}
}
plainText:="WELLDONEISBETTERTHANWELLSAID";
println("The original plaintext is : ",plainText);
println("\nThe left and right alphabets after each permutation"
" during encryption are:");
cipherText:=Chao.encode(plainText);
println("\nThe ciphertext is : ",cipherText);
 
plainText2:=Chao.decode(cipherText);
println("\nThe recovered plaintext is : ",plainText2);
Output:
The original plaintext is : WELLDONEISBETTERTHANWELLSAID

The left and right alphabets after each permutation during encryption are:
ONYQHXUCZVAMDBSLKPEFJRIGTW XUCPTLNBQDEOYMSFAVZKGJRIHW  21
ADBSLKPEFJRIGMTWONYQHXUCZV OYSFAVZKGJRIHMWXUCPTLNBQDE  10
HUCZVADBSLKPEXFJRIGMTWONYQ NBDEOYSFAVZKGQJRIHMWXUCPTL  20
QUCZVADBSLKPEHXFJRIGMTWONY NBEOYSFAVZKGQDJRIHMWXUCPTL  25
HFJRIGMTWONYQXUCZVADBSLKPE JRHMWXUCPTLNBIEOYSFAVZKGQD  13
CVADBSLKPEHFJZRIGMTWONYQXU YSAVZKGQDJRHMFWXUCPTLNBIEO  15
NQXUCVADBSLKPYEHFJZRIGMTWO BIOYSAVZKGQDJERHMFWXUCPTLN  21
YHFJZRIGMTWONEQXUCVADBSLKP RHFWXUCPTLNBIMOYSAVZKGQDJE  13
NQXUCVADBSLKPEYHFJZRIGMTWO MOSAVZKGQDJERYHFWXUCPTLNBI  12
XCVADBSLKPEYHUFJZRIGMTWONQ AVKGQDJERYHFWZXUCPTLNBIMOS  2
TONQXCVADBSLKWPEYHUFJZRIGM IMSAVKGQDJERYOHFWZXUCPTLNB  21
SKWPEYHUFJZRILGMTONQXCVADB RYHFWZXUCPTLNOBIMSAVKGQDJE  10
ZILGMTONQXCVARDBSKWPEYHUFJ LNBIMSAVKGQDJOERYHFWZXUCPT  10
JILGMTONQXCVAZRDBSKWPEYHUF LNIMSAVKGQDJOBERYHFWZXUCPT  25
RBSKWPEYHUFJIDLGMTONQXCVAZ RYFWZXUCPTLNIHMSAVKGQDJOBE  14
RSKWPEYHUFJIDBLGMTONQXCVAZ YFZXUCPTLNIHMWSAVKGQDJOBER  0
HFJIDBLGMTONQUXCVAZRSKWPEY LNHMWSAVKGQDJIOBERYFZXUCPT  7
JDBLGMTONQUXCIVAZRSKWPEYHF MWAVKGQDJIOBESRYFZXUCPTLNH  2
BGMTONQUXCIVALZRSKWPEYHFJD VKQDJIOBESRYFGZXUCPTLNHMWA  2
YFJDBGMTONQUXHCIVALZRSKWPE HMAVKQDJIOBESWRYFGZXUCPTLN  21
HIVALZRSKWPEYCFJDBGMTONQUX RYGZXUCPTLNHMFAVKQDJIOBESW  13
QXHIVALZRSKWPUEYCFJDBGMTON SWYGZXUCPTLNHRMFAVKQDJIOBE  23
KPUEYCFJDBGMTWONQXHIVALZRS NHMFAVKQDJIOBRESWYGZXUCPTL  10
SPUEYCFJDBGMTKWONQXHIVALZR NHFAVKQDJIOBRMESWYGZXUCPTL  25
OQXHIVALZRSPUNEYCFJDBGMTKW WYZXUCPTLNHFAGVKQDJIOBRMES  15
UEYCFJDBGMTKWNOQXHIVALZRSP GVQDJIOBRMESWKYZXUCPTLNHFA  12
JBGMTKWNOQXHIDVALZRSPUEYCF OBMESWKYZXUCPRTLNHFAGVQDJI  5
YFJBGMTKWNOQXCHIDVALZRSPUE JIBMESWKYZXUCOPRTLNHFAGVQD  23

The ciphertext is : OAHQHCNYNXTSZJRRHJBYHQKSOUJY

The recovered plaintext is : WELLDONEISBETTERTHANWELLSAID