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Technical and historical 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 like the real machines. This website is also preserved on the Internet Archive.

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U.S. KL-7 ADONIS

Enigma Simulator

One-Time Pad

Numbers Stations

Operation Tinker Bell

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RECENT UPDATES * 14 May 2025 Refresh Updates

KL-7 Tech & History Improved text re-entry principle and updated drawing.
Enigma Challenge Raphael Amhof & Andy Huynh 90th to complete challenge.
Articles History of the TSEC/KL-7 ADONIS & POLLUX updated Version 4.2
SIGINT Chatter 20 Years of Cryptologic Challenges, overview and statistics.
More Updates available in the updates archive (also via the icon on the left)

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