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Cryptologic History

Every little bit helps the NCF to influence the cryptologic future by sharing our educational resources, stimulating new knowledge, and commemorating our heritage.

"On This Date in Cryptologic History" Calendar

1942: Allies realized code was broken by Germans.

Sunday, June 29, 2025

29 June 1942: The Allies realized that the US diplomatic code had been broken by the Germans.

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Check out the Cryptologic Bytes Archives for a wide variety of articles on all topics related to cryptology, codes and ciphers, related publications, Museums, and more.