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Chaocipher: Difference between revisions

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Chaocipher (view source)

Revision as of 22:02, 5 September 2023

640 bytes removed ,  8 months ago
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→‎{{header|QBasic}}: Corregido código
(Added QBasic)
m (→‎{{header|QBasic}}: Corregido código)
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=={{header|QBasic}}==
{{trans|BASIC}}
<syntaxhighlight lang="qbasic">DECLARE FUNCTION AlphaLeft$ (ct AS STRING$, pt AS STRING$, CharPos AS INTEGER!)
DECLARE FUNCTION AlphaRight$ (ct AS STRING$, pt AS STRING$, CharPos AS INTEGER!)
DECLARE FUNCTION EncodeDecode$ (Text AS STRING$, ct AS STRING$, pt AS STRING$)
DECLARE FUNCTION DecodeEncode$ (Text AS STRING$, ct AS STRING$, pt AS STRING$)
 
CLS
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' Deciphering a Chaocipher-encrypted message is identical to the steps used
' for enciphering. The sole difference is that the decipherer locates the
' known ciphertext letter in the left (ct$) alphabet, with the plaintext
' letter being the corresponding letter in the right (pt$) alphabet
'
' Alphabet permuting is identical in enciphering and deciphering
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' Start of Main Code
 
' LEFT (Cipher Text$): HXUCZVAMDSLKPEFJRIGTWOBNYQ
DIM tLeft AS STRING: tLeft$ = "HXUCZVAMDSLKPEFJRIGTWOBNYQ"
 
' RIGHT (Plain Text$): PTLNBQDEOYSFAVZKGJRIHWXUMC
DIM tRight AS STRING: tRight$ = "PTLNBQDEOYSFAVZKGJRIHWXUMC"
 
' Cipher Message (Used to verify a good encoding)
DIM cText AS STRING: cText$ = "OAHQHCNYNXTSZJRRHJBYHQKSOUJY"
 
' Plain Text$ Message
DIM pText AS STRING: pText$ = "WELLDONEISBETTERTHANWELLSAID"
PRINT " Plain Text$: "; pText: PRINT$
PRINT
 
DIM ctLeft AS STRING: ctLeft$ = tLeft$
DIM ptRight AS STRING: ptRight$ = tRight$
 
' Final Cipher Text$
DIM eText AS STRING: eText$ = Encode$(pText$, ctLeft$, ptRight$)
PRINT " Cipher Text$: "; eText: PRINT$
PRINT
 
IF eText$ = cText$ THEN PRINT "Successful" ELSE PRINT "Failed"
 
ctLeft$ = tLeft: ptRight = tRight$
ptRight$ = tRight$
DIM dText AS STRING: dText$ = Decode$(eText$, ctLeft$, ptRight$)
PRINT : PRINT " Plain Text: "; dText: PRINT▼
PRINT
▲PRINT : PRINT " Plain Text$: "; dText: PRINT$
PRINT
 
IF dText$ = pText$ THEN PRINT "Successful" ELSE PRINT "Failed"
END
 
' Left Alphabet
FUNCTION AlphaLeft$ (ct AS STRING$, pt AS STRING$, CharPos AS INTEGER)
DIM tStr AS STRING: tStr$ = ct$
' 1. Shift the entire left alphabet cyclically so the ciphertext letter
' just enciphered is positioned at the zenith (i.e., position 1).
tStr$ = RIGHT$(ct$, LEN(ct$) - CharPos + 1) + LEFT$(ct$, CharPos - 1)
' 2. Extract the letter found at position zenith+1 (i.e., the letter to
' the right of the zenith), taking it out of the alphabet, temporarily
' leaving an unfilled "holeHole$"
DIM Hole AS STRING: Hole$ = MID$(tStr, 2, 1): MID$(tStr, 2, 1) = " "
MID$(tStr$, 2, 1) = " "
' 3. Shift all letters in positions zenith+2 up to, and including, the
' nadir (zenith+13), moving them one position to the left
tStr$ = LEFT$(tStr$, 1) + MID$(tStr$, 3, 12) + " " + RIGHT$(tStr$, 12)
' 4. Insert the just-extracted letter into the nadir position
' (i.e., zenith+13)
MID$(tStr$, 14, 1) = Hole$
AlphaLeft$ = tStr$
END FUNCTION
 
' Right Alphabet
FUNCTION AlphaRight$ (ct AS STRING$, pt AS STRING$, CharPos AS INTEGER)
DIM tStr AS STRING: tStr$ = pt$
' 1. Shift the entire right alphabet cyclically so the plaintext letter
' just enciphered is positioned at the zenith.
tStr$ = RIGHT$(tStr$, LEN(tStr$) - CharPos + 1) + LEFT$(tStr$, CharPos - 1)
' 2. Now shift the entire alphabet one more position to the left (i.e.,
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' letter into the zenith position.
tStr$ = RIGHT$(tStr$, 25) + LEFT$(tStr$, 1)
' 3. Extract the letter at position zenith+2, taking it out of the
' alphabet, temporarily leaving an unfilled "holeHole$".
DIM Hole AS STRING: Hole$ = MID$(tStr, 3, 1): MID$(tStr, 3, 1) = " ":
MID$(tStr$, 3, 1) = " ":
' 4. Shift all letters beginning with zenith+3 up to, and including, the
' nadir (zenith+13), moving them one position to the left.
tStr$ = LEFT$(tStr$, 2) + MID$(tStr$, 4, 11) + " " + RIGHT$(tStr$, 12)
' 5. Insert the just-extracted letter into the nadir position (zenith+13)
MID$(tStr$, 14, 1) = Hole$
AlphaRight$ = tStr$
END FUNCTION
 
FUNCTION Decode$ (Text AS STRING$, ct AS STRING$, pt AS STRING$)
DIMtStr$ t= AS INTEGER""
DIM tStr AS STRING: tStr = ""
FOR t = 1 TO LEN(Text$)
DIM Char AS STRING: Char$ = MID$(Text$, t, 1)
DIM CharPos AS INTEGER: CharPos = INSTR(ct$, Char$)
ct$ = AlphaLeft$(ct$, pt$, CharPos)
pt$ = AlphaRight$(ct$, pt$, CharPos)
tStr$ = tStr$ + RIGHT$(pt$, 1)
NEXT
Decode$ = tStr$
END FUNCTION
 
FUNCTION Encode$ (Text AS STRING$, ct AS STRING$, pt AS STRING$)
DIMtStr$ t= AS INTEGER""
DIM tStr AS STRING: tStr = ""
FOR t = 1 TO LEN(Text$)
DIM Char AS STRING: Char$ = MID$(Text$, t, 1)
DIM CharPos AS INTEGER: CharPos = INSTR(pt$, Char$)
ct$ = AlphaLeft$(ct$, pt$, CharPos)
pt$ = AlphaRight$(ct$, pt$, CharPos)
tStr$ = tStr$ + LEFT$(ct$, 1)
NEXT
Encode$ = tStr$
END FUNCTION</syntaxhighlight>
</syntaxhighlight>
 
=={{header|Raku}}==
Jjuanhdez
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