Close
Menu

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

Thursday, September 11, 2025

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.

Related Links
Return to Calendar

Learn About the Pioneers

Learn about the various individuals and groups who paved the way in the field of cryptology, cyber, computers, and more.