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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

SIGINT Blog

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Archive

RECENT UPDATES * 22 January 2023 - Refresh page for newest version!

Operation Tinker Bell Maggie Koo is the 21st to complete Operation Tinker Bell.
KL-7 Tech & History development KL-7 and its rotors rearranged chronologically
KL-7 Tech & History doc request HL-1 tape readers and KLX-7 adaptors by FRG.
Crypto Box Challenge 10th from 82 participants completed Crypto Box Challenge.
More Updates available in the updates archive (also via the icon on the left).

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