in reply to Re^2: Breaking the indecipherable cipher, courtesy Charles Babbage.
in thread Breaking the indecipherable cipher, courtesy Charles Babbage.
your algorithm works well your only fail is to feed your vigener cipher machine with simbols others than alphabetics ones.
Problems of keeping spaces on your ciphertext are that there are some words that are very common on your language (examples: the, and, of, I, you ...), and the same goes for other simbols like the ``''' and the ``?''. So in old cipher methods is important to remove this simbols (except on transposition ciphers like the scitale ^_^>)
i think your algorithm failed because of those spureous simbols
prove with this text instead:
TheVigenerecipherknownbysomeaslechiffreindechiffrableFrenchfor theindecipherablecipherisamethodofencryptionthatusesaseriesof differentCaesarciphersbasedonthelettersofakeywordthoughthereis someargumentamongcryptographiccirclesastowhichincarnationofthis particularpolyalphabeticsubstitutioncanaccuratelybeattributedtoBlaise deVigenereThisimplementationisasimpleformofapolyalphabetic substitutionToencipheratableofalphabetscanbeusedtermedatabula rectaorVigeneretableItconsistsofthealphabetwrittenout26times indifferentrowseachalphabetshiftedcycliclytotheleftcomparedtothe previousalphabetIncidentallytheresagoodchancethatthisplaintext islongenoughtodisplaythecryptographicalweaknessofthisparticular algorithmCanyouspotit
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Re^4: Breaking the indecipherable cipher, courtesy Charles Babbage.
by chargrill (Parson) on May 19, 2006 at 20:29 UTC
by turo (Friar) on May 20, 2006 at 03:15 UTC