Vigenère cipher: Difference between revisions
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(→{{header|AutoHotkey}}: shortened Decipher routine by taking advantage of the trick posted in talk page) |
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VigenereDecipher(Text, key){ |
VigenereDecipher(Text, key){ |
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Loop Parse, |
Loop Parse, key |
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decoderKey .= Chr(26-(Asc(A_LoopField)-65)+65) |
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{ |
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return VigenereCipher(Text, decoderKey) |
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a := Asc(A_LoopField) - Asc("A") |
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b := Asc(SubStr(Key, 1+Mod(A_Index-1, StrLen(Key)), 1)) - Asc("A") |
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if (a-b) < 0 |
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n := 26-(b-a) |
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else n := a-b |
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out .= Chr(Mod(n,26)+Asc("A")) |
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} |
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return out |
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}</lang> |
}</lang> |
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Output: |
Output: |
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Ciphertext =WMCEEIKLGRPIFVMEUGXQPWQVIOIAVEYXUEKFKBTALVXTGAFXYEVKPAGY |
Ciphertext =WMCEEIKLGRPIFVMEUGXQPWQVIOIAVEYXUEKFKBTALVXTGAFXYEVKPAGY |
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Decrypted =BEWARETHEJABBERWOCKMYSONTHEJAWSTHATBITETHECLAWSTHATCATCH</pre> |
Decrypted =BEWARETHEJABBERWOCKMYSONTHEJAWSTHATBITETHECLAWSTHATCATCH</pre> |
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=={{header|C}}== |
=={{header|C}}== |
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<lang C>#include <stdio.h> |
<lang C>#include <stdio.h> |
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