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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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RECENT UPDATES * 17 March 2025 Refresh Updates

Operation Tinker Bell Johnny Cheung is the 31st to complete the operation.
Enigma Challenge Diego Varela Penas is the 89th to complete the challenge.
SIGINT Chatter 20 Years of Cryptologic Challenges, overview and statistics.
KL-7 Tech & History Added sanitized CIA copies of Joseph Helmich spy case.
More Updates available in the updates archive (also via the icon on the left)

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