Revision history of "File:Crypt.jpg"

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• (cur) (prev) 04:19, 3 April 2009 Katmehm (Talk) (421 bytes) (1518 Johannes Trithemius wrote the first printed book on cryptology. He invented a steganographic cipher in which each letter was represented as a word taken from a succession of columns. The resulting series of words would be a legitimate prayer. He also)

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