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This website covers WW2 and Cold War era cipher machines, detailed technical and historical information, and manual ciphers. Learn how the equipment works and how it was 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 * 01 October 2025 Refresh for Latest Updates

Enigma Challenge Rolf Schneider from Switzerland is 92nd to complete challenge.
History TSEC/KL-7 Version 5.2 more details, clarifications and improved text.
KL-7 Tech & History NATO docs Walker and Helmich spy cases added.
Enigma Challenge Yingjie Wang from China is the 91st to complete challenge.
Crypto News Papers from British computer pioneer Alan Turing auctioned.

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