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Talk:Vigenère cipher/Cryptanalysis: Difference between revisions
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: There. I changed the chi-squared test to something that maximizes the correlation instead. Smaller pieces increase the correlation artificially, so I added a weight against them. It seems to work on nearly all the ciphertext I've tried. Long keys are more likely to cause errors, but it still gets the length and most of the characters. A second pass to try and correct any errors by looking for words or common trigrams might not be a bad idea, but I don't think I'll do that myself. [[User:MagiMaster|MagiMaster]] 20:26, 31 May 2011 (UTC)
== Difficulty and suggested improvements ==
This is a huge amount of text which makes the task much easier. As a hobby I used to solve these by hand and we would typically get cipher texts of 15-20 5 letter groups. This cipher text has 165 groups!
I suggest to make it more interesting, that we try our algorithms on successively shorter texts (halving the text each time) and see how low we can drive it.--[[User:Dgamey|Dgamey]] 12:28, 3 June 2011 (UTC)
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