Talk:Substitution cipher: Difference between revisions
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== Old Things may be woken! == |
== Old Things may be woken! == |
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I daren't read the REXX cypher-text out loud. Old Things may be woken! --[[User:Tim-brown|Tim-brown]] ([[User talk:Tim-brown|talk]]) 07:07, 15 October 2015 (UTC) |
I daren't read the REXX cypher-text out loud. Old Things may be woken! --[[User:Tim-brown|Tim-brown]] ([[User talk:Tim-brown|talk]]) 07:07, 15 October 2015 (UTC) |
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:: Yes, it does sound like some strange incantation, like a record being played backward. -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 15:06, 14 January 2020 (UTC) |
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== Task needs to specify some examples == |
== Task needs to specify some examples == |
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This task should really specify some examples to be tried by each implementation. --[[User:Rdm|Rdm]] ([[User talk:Rdm|talk]]) 14:32, 15 October 2015 (UTC) |
This task should really specify some examples to be tried by each implementation. --[[User:Rdm|Rdm]] ([[User talk:Rdm|talk]]) 14:32, 15 October 2015 (UTC) |
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== Task: substitute cipher in PowerBASIC == |
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=={{header|PowerBASIC}}== |
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<lang PowerBASIC> |
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'PBCC 6.03 version |
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' uses same alphabet and key as Ada language example |
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$string1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" |
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$string2 = "VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN" |
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%true = -1 |
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%false = 0 |
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FUNCTION PBMAIN() AS LONG |
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PROCESS1 "plain.txt", "encrypted.txt", %true |
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PROCESS1 "encrypted.txt", "decrypted.txt",%false |
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PRINT |
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PRINT "Press any key to quit" |
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WAITKEY$ |
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END FUNCTION |
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SUB process1(inputFile AS STRING, outputFile AS STRING, encrypt AS INTEGER) |
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DIM i AS INTEGER |
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OPEN inputFile FOR INPUT AS #1 |
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IF ERR > 0 THEN |
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PRINT "Unable to open input file" |
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WAITKEY$ |
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END |
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END IF |
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DIM alpha AS STRING, key1 AS STRING |
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IF encrypt THEN |
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alpha = $string1 : key1 = $string2 |
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ELSE |
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alpha = $string2 : key1 = $string1 |
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END IF |
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OPEN outputFile FOR OUTPUT AS #2 |
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DIM s AS STRING |
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DIM p AS INTEGER |
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DIM currentChar AS INTEGER |
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WHILE NOT EOF(1) |
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LINE INPUT #1, s |
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FOR i = 1 TO LEN(s) |
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currentChar = ASC(MID$(s, i, 1)) |
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IF (currentChar >= 65 AND currentChar <= 90) OR (currentChar >= 97 AND currentChar <= 122) THEN |
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p = INSTR(alpha, MID$(s, i, 1)) |
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MID$(s, i, 1) = MID$(key1, p, 1) |
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END IF |
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NEXT |
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PRINT #2, s |
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WEND |
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CLOSE #1 : CLOSE #2 |
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END SUB |
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</lang> |
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Latest revision as of 09:35, 9 March 2021
Old Things may be woken!
I daren't read the REXX cypher-text out loud. Old Things may be woken! --Tim-brown (talk) 07:07, 15 October 2015 (UTC)
- Yes, it does sound like some strange incantation, like a record being played backward. -- Gerard Schildberger (talk) 15:06, 14 January 2020 (UTC)
Task needs to specify some examples
This task should really specify some examples to be tried by each implementation. --Rdm (talk) 14:32, 15 October 2015 (UTC)
Task: substitute cipher in PowerBASIC
PowerBASIC
<lang PowerBASIC> 'PBCC 6.03 version
' uses same alphabet and key as Ada language example $string1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" $string2 = "VsciBjedgrzyHalvXZKtUPumGfIwJxqOCFRApnDhQWobLkESYMTN"
%true = -1 %false = 0
FUNCTION PBMAIN() AS LONG
PROCESS1 "plain.txt", "encrypted.txt", %true PROCESS1 "encrypted.txt", "decrypted.txt",%false
PRINT PRINT "Press any key to quit"
WAITKEY$
END FUNCTION
SUB process1(inputFile AS STRING, outputFile AS STRING, encrypt AS INTEGER)
DIM i AS INTEGER
OPEN inputFile FOR INPUT AS #1
IF ERR > 0 THEN PRINT "Unable to open input file" WAITKEY$ END END IF
DIM alpha AS STRING, key1 AS STRING
IF encrypt THEN alpha = $string1 : key1 = $string2 ELSE alpha = $string2 : key1 = $string1 END IF
OPEN outputFile FOR OUTPUT AS #2
DIM s AS STRING DIM p AS INTEGER DIM currentChar AS INTEGER
WHILE NOT EOF(1) LINE INPUT #1, s
FOR i = 1 TO LEN(s)
currentChar = ASC(MID$(s, i, 1))
IF (currentChar >= 65 AND currentChar <= 90) OR (currentChar >= 97 AND currentChar <= 122) THEN
p = INSTR(alpha, MID$(s, i, 1))
MID$(s, i, 1) = MID$(key1, p, 1)
END IF
NEXT
PRINT #2, s WEND
CLOSE #1 : CLOSE #2
END SUB </lang>