Cryptologic History

"On This Date in Cryptologic History" Calendar

1940: "Odd/Even" Agreement for Army & Navy

Saturday, October 3, 2026

3 October 1940: U.S. Army and Navy agreed to "odd/even" day division of effort on Japanese diplomatic cipher.

Learn About the Pioneers

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