Cracking the Adventure Time cipher

Re:Cracking the Adventure Time cipher by zeveb on Monday August 01, 2016 @03:59PM (#12205419)

The cypher you describe sounds like a weaker version of a Vignère cypher, which resisted cryptanalysis until 1863, after nearly three hundred years of use. The Wikipedia page has a decent description of how to cryptanalyse that sort of polyalphabetic cypher.

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Re:Cracking the Adventure Time cipher by Analemma_ on Monday August 01, 2016 @04:06PM (#12205477)

You're right, it looks like my scheme is equivalent to a Vignère cypher with "ABCDEFGHIJKLMNOPQRSTUVWXYZ" as the key, with the weaknesses thereof. Thanks!

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Re:Cracking the Adventure Time cipher by bdr on Monday August 01, 2016 @04:52PM (#12205844)

You might be interested to read "Cryptanalysis: A Study of Ciphers and Their Solution", a 1939 (!) book by Helen Fouché Gaines. It covers a lot of these kinds of variants.

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