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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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RECOMMENDED PAGES

U.S. KL-7 ADONIS

Enigma Simulator

One-Time Pad

Numbers Stations

Operation Tinker Bell

SIGINT Blog

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UPDATES & NEW ITEMS * 24 September 2022 - Refresh page for newest version

KL-7 Tech & History Details two motor-generator versions and speed control.
KL-7 Tech & History Explained printing and sequence of characters on print drum.
KL-7 Tech & History Added diagram HL-1 tape reader and KLX-7 Keyboard adapter.
SIGINT Chatter Joseph Helmich – The KL-7 for Cash Spy Case.
Elite Box Challenge Announcing the Elite Box Challenge will start on March 18.

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