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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

1946: CREAM replaced ULTRA.

Sunday, March 15, 2026

15 March 1946: CREAM replaced ULTRA as the codeword for top secret cryptanalytic material.

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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.