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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

Learn about a wide variety of historical events related to cryptology, computers, math, cybersecurity, Intelligence, and more.

August 2025

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S M T W T F S
27 28 29 30 Jul 31 Aug 1 2
1972: Lt. Gen Sam Phillips Becomes DIRNSA....
1943: Australian Coastwatchers Send Code
1969: VADM Noel Gayler becomes DIRNSA
1958: Dr. Louis Tordella became D/DIRNSA
1920: Brigadier John H. Tiltman Joined GC & CS
3 4 5 6 7 8 9
1918: "Mohawk" Field Code was issued.
1955: Prototype U-2 Flight
1963: Limited Nuclear Test Ban Treaty
1945: US Dropped Atomic Bomb Over Hiroshima
1944: "The Harvard Mark 1"
1975: Lt Gen Lew Allen Testifies
1945: Nagasaki
1987: Death of Joseph Desch - innovative engineer for the National Cash Register Company
1925: Radio Orphan Annie Secret Society
1958: Herbert O. Yardley Died
2008: Georgia-Russia Cyber Attacks
1994: Solomon Kullback Died
10 11 12 13 14 15 16
1972: Last U.S. Ground Combat Unit Leaves Vietnam
1918: "Allegheny" Field Code was issued.
1944: Spy Velvalee Dickinson Sentenced
1945: Japan Announced Surrender
1858: Early Telegraph Communications
1942: Hedy Markey (Lamarr) Receives Patent
1981: IBM PC Debut
1982: Navajo Code Talkers Day Declared
17 18 19 20 21 22 23
1846: Étienne Bazeries Birth Date
1956: U.S. Navy Recon Plane Shot Down
1907: Abraham Sinkov was born.
24 25 26 27 28 29 30
1948: Stone Board Has First Meeting
1914: Russian Navy Seized Codebooks
1878: Colonel Parker Hitt's Birth Date
1949: Soviets Detonate Atomic Bomb
1778: Beginnings of Culper Spy Ring with GEN Washington & MAJ Tallmadge
Poland and Britain signed the Agreement of Mutual Assistance.
1892: Elizebeth Smith Friedman Birth Date
Aug 31 Sep 1 2 3 4 5 6
1914: German Intercepts of Russian Radio Traffic
Friday, August 1, 2025
Saturday, August 2, 2025
Sunday, August 3, 2025
Monday, August 4, 2025
Tuesday, August 5, 2025
Wednesday, August 6, 2025
Thursday, August 7, 2025
Friday, August 8, 2025
Saturday, August 9, 2025
Monday, August 11, 2025
Tuesday, August 12, 2025
Thursday, August 14, 2025
Friday, August 15, 2025
Saturday, August 16, 2025
Thursday, August 21, 2025
Friday, August 22, 2025
Monday, August 25, 2025
Tuesday, August 26, 2025
Wednesday, August 27, 2025
Friday, August 29, 2025
Sunday, August 31, 2025

Learn About the Pioneers

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