Historical and technical
information about WW2 and Cold War cipher
machines and the fascinating world of cryptology.
Learn how crypto equipment works and how it is
operated. You can download realistic software
simulations that work exactly as the real
& NEW ITEMS (9 July 2018)
added digraph substitution ciphers
Challenge John Davies
completed the challenge!
OTP Radiograms 101
Reviews Deep Undercover
by Jack Barsky
DIANA - A Fast Reciprocal One-time Pad Table
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Dirk Rijmenants 2004 - 2018