Announcing: First-ever collection of declassified Chaocipher-relatedcorrespondences
in [Cryptography]
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From: Mok-Kong Shen on 7 Oct 2009 05:13 mosherubin wrote: > The "Chaocipher Clearing House" is a web site dedicated to tracking > cryptanalytic work related to solving John F. Byrne's Chaocipher. The > site can be found at http://www.mountainvistasoft.com/chaocipher. [snip] The following is my layman's speculation with reference to your progress Report No. 1: If one has doubled plaintext letters, say in the sequence 'aab', couldn't it be that the second character 'a' is processed by an extra rule different from the normal one of shifting thereafter one, two, or three positions? (This extra rule could be a shift of n positions, with n not in [1..3].) That is, one first processes as if the second character 'a' were missing and subsequently insert the cipher character corresponding to the second 'a' into the right place. (Or some other procedure quite equivalent to that.) Since doubled plaintext letters occur with comparatively low frequency, this could eventually resolve the issue of incompatibility you stated in the summary of your findings, I would think. May I repeat that the above is merely a layman's speculation based on a certainly very superficial and poor understanding of your report. I sincerely beg your pardon, if it falls rightaway after a few minutes of scrutiny by you. Thanks, M. K. Shen |