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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

1952: Pre-employment Polygraph at NSA.

Saturday, December 6, 2025

6 December 1952: Pre-employment polygraph became mandatory at NSA.

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Learn About the Pioneers

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