Bacon cipher: Difference between revisions
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</pre>
=={{header|
==={{header|BaCon}}===
A Bacon cipher in [[BaCon]]. Using unique identifiers 'aaaaa'-'bbaab' for a-z and, as other examples on this page, using 'bbbaa' (28) for the space character.
<syntaxhighlight lang="qbasic">msg$ = "the quick brown fox jumps over the lazy dog"
Line 655 ⟶ 656:
BacON's cIPHer Is a METhoD of stEgAnogRaphy crEatEd By FRAncis baCOn.thIs TASk Is TO imPLeMENT a proGrAm FOR eNcRYPTIOn anD deCRyPtioN Of plAINTExt UsING the SIMpLe AlPhaBet Of thE BAConIan CIphER Or sOme OTHer kInD Of reprESenTATion OF This alPHaBET (makE An
Decoded:
the quick brown fox jumps over the lazy dog</pre>
==={{header|Visual Basic .NET}}===
{{trans|C#}}
<syntaxhighlight lang="vbnet">Imports System.Text
Module Module1
ReadOnly CODES As New Dictionary(Of Char, String) From {
{"a", "AAAAA"}, {"b", "AAAAB"}, {"c", "AAABA"}, {"d", "AAABB"}, {"e", "AABAA"},
{"f", "AABAB"}, {"g", "AABBA"}, {"h", "AABBB"}, {"i", "ABAAA"}, {"j", "ABAAB"},
{"k", "ABABA"}, {"l", "ABABB"}, {"m", "ABBAA"}, {"n", "ABBAB"}, {"o", "ABBBA"},
{"p", "ABBBB"}, {"q", "BAAAA"}, {"r", "BAAAB"}, {"s", "BAABA"}, {"t", "BAABB"},
{"u", "BABAA"}, {"v", "BABAB"}, {"w", "BABBA"}, {"x", "BABBB"}, {"y", "BBAAA"},
{"z", "BBAAB"}, {" ", "BBBAA"} ' use " " To denote any non-letter
}
Function Encode(plainText As String, message As String) As String
Dim pt = plainText.ToLower()
Dim sb As New StringBuilder()
For Each c In pt
If "a" <= c AndAlso c <= "z" Then
sb.Append(CODES(c))
Else
sb.Append(CODES(" "))
End If
Next
Dim et = sb.ToString()
Dim mg = message.ToLower() '"A"s to be in lower case, "B"s in upper case
sb.Length = 0
Dim count = 0
For Each c In mg
If "a" <= c AndAlso c <= "z" Then
If et(count) = "A" Then
sb.Append(c)
Else
sb.Append(Chr(Asc(c) - 32)) ' upper case equivalent
End If
count += 1
If count = et.Length Then
Exit For
End If
Else
sb.Append(c)
End If
Next
Return sb.ToString()
End Function
Function Decode(message As String) As String
Dim sb As New StringBuilder
For Each c In message
If "a" <= c AndAlso c <= "z" Then
sb.Append("A")
ElseIf "A" <= c AndAlso c <= "Z" Then
sb.Append("B")
End If
Next
Dim et = sb.ToString()
sb.Length = 0
For index = 0 To et.Length - 1 Step 5
Dim quintet = et.Substring(index, 5)
Dim key = CODES.Where(Function(a) a.Value = quintet).First().Key
sb.Append(key)
Next
Return sb.ToString()
End Function
Sub Main()
Dim plainText = "the quick brown fox jumps over the lazy dog"
Dim message =
"bacon's cipher is a method of steganography created by francis bacon. " +
"this task is to implement a program for encryption and decryption of " +
"plaintext using the simple alphabet of the baconian cipher or some " +
"other kind of representation of this alphabet (make anything signify anything). " +
"the baconian alphabet may optionally be extended to encode all lower " +
"case characters individually and/or adding a few punctuation characters " +
"such as the space."
Dim cipherText = Encode(plainText, message)
Console.WriteLine("Cipher text ->" & Environment.NewLine & "{0}", cipherText)
Dim decodedText = Decode(cipherText)
Console.WriteLine(Environment.NewLine & "Hidden text ->" & Environment.NewLine & "{0}", decodedText)
End Sub
End Module</syntaxhighlight>
{{out}}
<pre>Cipher text ->
BacON's cIPHer Is a METhoD of stEgAnogRaphy crEatEd By FRAncis baCOn. thIs TASk Is TO imPLeMENT a proGrAm FOR eNcRYPTIOn anD deCRyPtioN Of plAINTExt UsING the SIMpLe AlPhaBet Of thE BAConIan CIphER Or sOme OTHer kInD Of reprESenTATion OF This alPHaBET (makE An
Hidden text ->
the quick brown fox jumps over the lazy dog</pre>
Line 1,185 ⟶ 1,284:
=={{header|Fōrmulæ}}==
{{FormulaeEntry|page=https://formulae.org/?script=examples/Bacon%27s_cipher}}
'''Solution'''
'''Program for encoding.''' It uses the extended version of the alphabeth, which can be calculated programatically, with no table.
[[File:Fōrmulæ - Bacon's cipher 01.png]]
'''Test case for encoding'''
[[File:Fōrmulæ - Bacon's cipher 02.png]]
[[File:Fōrmulæ - Bacon's cipher 03.png]]
'''Program for decoding'''
[[File:Fōrmulæ - Bacon's cipher 04.png]]
'''Test case for decoding'''
[[File:Fōrmulæ - Bacon's cipher 05.png]]
[[File:Fōrmulæ - Bacon's cipher 06.png]]
=={{header|Go}}==
Line 2,949 ⟶ 3,066:
Hidden text ->
the quick brown fox jumps over the lazy dog</pre>
Line 3,140 ⟶ 3,159:
{{trans|Kotlin}}
{{libheader|Wren-str}}
{{libheader|Wren-
<syntaxhighlight lang="
import "./
class Bacon {
Line 3,211 ⟶ 3,230:
System.print("\nHidden text ->\n\n%(decodedText)")</syntaxhighlight>
{{out}}
<pre>
Cipher text ->
BacON's cIPHer Is a METhoD of stEgAnogRaphy crEatEd By FRAncis baCOn.thIs TASk Is TO imPLeMENT a proGrAm FOR eNcRYPTIOn anD deCRyPtioN Of plAINTExt UsING the SIMpLe AlPhaBet Of thE BAConIan CIphER Or sOme OTHer kInD Of reprESenTATion OF This alPHaBET (makE An
Hidden text ->
the quick brown fox jumps over the lazy dog
</pre>
=={{header|XPL0}}==
{{trans|C}}
Works on Raspberry Pi. (MAlloc works differently in other versions.)
<syntaxhighlight lang "XPL0">include xpllib; \for StrCmp, StrLen, Print, ToLower, StrNCopy
int Codes;
func GetCode(C);
char C;
[if C >= 97 and C <= 122 then return Codes(C-97);
return Codes(26);
];
func GetChar(Code);
char Code;
int I;
[if StrCmp(Codes(26), Code) = 0 then return ^ ;
for I:= 0 to 26-1 do
if StrCmp(Codes(I), Code) = 0 then return 97+I;
Print("\nCode ^"%s^" is invalid\n", Code);
exit(1);
];
proc StrToLower(S);
char S;
int I;
for I:= 0 to StrLen(S)-1 do S(I):= ToLower(S(I));
func BaconEncode(PlainText, Message);
char PlainText, Message;
int I, Count;
int PLen, MLen, ELen;
char C, P, Et, Mt;
[PLen:= StrLen(PlainText);
MLen:= StrLen(Message);
ELen:= 5 * PLen;
Et:= MAlloc(ELen+1);
StrToLower(PlainText);
P:= Et;
for I:= 0 to PLen-1 do
[C:= PlainText(I);
StrNCopy(P, GetCode(C), 5);
P:= P+5;
];
P:= P+1; P(0):= 0;
\'A's to be in lowercase, 'B's in uppercase
StrToLower(Message);
Mt:= MAlloc(MLen+1);
Count:= 0;
for I:= 0 to MLen-1 do
[C:= Message(I);
if C >= ^a and C <= ^z then
[if Et(Count) = ^A then Mt(I):= C
else Mt(I):= C-32; \uppercase equivalent
Count:= Count+1;
if Count = ELen then I:= MLen;
]
else Mt(I):= C;
];
Release(Et);
return Mt;
];
func BaconDecode(CipherText);
char CipherText;
int I, Count, CLen, PLen;
char P, Ct, Pt, C, Quintet(6);
[CLen:= StrLen(CipherText);
Ct:= MAlloc(CLen+1);
Count:= 0;
for I:= 0 to CLen-1 do
[C:= CipherText(I);
if C >= ^a and C <= ^z then
[Ct(Count):= ^A; Count:= Count+1]
else if C >= ^A and C <= ^Z then
[Ct(Count):= ^B; Count:= Count+1];
];
PLen:= StrLen(Ct) / 5;
Pt:= MAlloc(PLen+1);
P:= Ct;
for I:= 0 to PLen-1 do
[StrNCopy(Quintet, P, 5);
Quintet(5):= 0;
Pt(I):= GetChar(Quintet);
P:= P+5;
];
Pt(PLen):= 0;
Release(Ct);
return Pt;
];
char PlainText, Message, CipherText, HiddenText;
[\Maps successively from 'a' to 'z' plus ' ' to denote any non-letter
Codes:= ["AAAAA", "AAAAB", "AAABA", "AAABB", "AABAA",
"AABAB", "AABBA", "AABBB", "ABAAA", "ABAAB",
"ABABA", "ABABB", "ABBAA", "ABBAB", "ABBBA",
"ABBBB", "BAAAA", "BAAAB", "BAABA", "BAABB",
"BABAA", "BABAB", "BABBA", "BABBB", "BBAAA",
"BBAAB", "BBBAA"];
PlainText:= "the quick brown fox jumps over the lazy dog";
Message:= "bacon's cipher is a method of steganography created by francis bacon.
this task is to implement a program for encryption and decryption of
plaintext using the simple alphabet of the baconian cipher or some
other kind of representation of this alphabet (make anything signify anything).
the baconian alphabet may optionally be extended to encode all lower
case characters individually and/or adding a few punctuation characters
such as the space.";
CipherText:= BaconEncode(PlainText, Message);
Print("Cipher text ->\n\n%s\n", CipherText);
HiddenText:= BaconDecode(CipherText);
Print("\nHidden text ->\n\n%s\n", HiddenText);
Release(CipherText);
Release(HiddenText);
]</syntaxhighlight>
{{out}}
<pre>
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