2 ms·
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
by zeveb 10y ago
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.
- Analemma_ 10y agoYou're right, it looks like my scheme is equivalent to a Vignère cypher with "ABCDEFGHIJKLMNOPQRSTUVWXYZ" as the key, with the weaknesses thereof. Thanks!
- bdr 10y agoYou 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.
- deleted 10y ago[deleted]