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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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Archive ***

RECENT UPDATES * 30 November 2022 - Refresh page for newest version!

Hagelin Crypto AG Added different ways crypto machines were weakened.
One-time Pad Added menu to jump to the various sections of the OTP page.
Enigma at School Olin College website migrated, links interim via Internet Archive.
SIGINT Chatter The Royal Navy Communications Branch Museum/Library
*** More Updates available in the updates archive (also via the icon on the left).

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