Viewing Single Post From: Transposition Cipher Cracker (c++)

Viewing Single Post From: Transposition Cipher Cracker (c++)
jdege	Dec 18 2007, 09:53 PM
Elite member Posts: 263 Group: Admin Member #246 Joined: December 7, 2006	Revelation Dec 18 2007, 03:27 PM It is Maybe even the ADFVX cipher, but that is a hard to brute force, so then I need a way of filtering out only the plausible combinations. Every issue of The Cryptogram advertises a number of publications. Among my recent purchases is GUNG HO's "Manual For Cryptanalysis of the Columnar Double Transposition Cipher". Apparently, it was pretty common to use the same keyword for both transpositions, which made things some easier. But the technique relied upon having enough traffic that there were several messages of identical length using the same key - at which point anagramming the messages simultaneously would pretty quickly reveal the plaintext. Single keyword, multiple keywords, interrupted columns, none of it matters at this point. The tricky part was to recover the keywords, so that you could read the rest of the traffic. That's where the difference between a one and two keywords would show up.
	When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.

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