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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

1940: Army & Navy Joint Exploitation of PURPLE

Saturday, September 11, 2027

11 September 1940: The U.S. Army and Navy signed an agreement on joint exploitation of Japanese PURPLE machines.

Read more about the "Magic of PURPLE" exhibit at the NCM via the link below.

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