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"On This Date in Cryptologic History" Calendar

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

September 2025

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S M T W T F S
Aug 31 Sep 1 2 3 4 5 6
1943: First Bombe to Nebraska Ave.
1918: Hudson Field Code
1968: "Star Trek: The Enterprise Incident"
1972: 11 Israeli Olympic athletes & German policeman killed.
1941: Winston Churchill Visited Bletchley Park
1983: KAL 007 Shot Down
1945: Japanese Surrender Event
1939: Army's SIS Translates PURPLE
1997: National Vigilance Park Dedicated
1958: C-130 Shot Down
7 8 9 10 11 12 13
1983: Inventor Boris Hagelin Died.
1947: Grace Hopper & the First Computer "Bug"
1877: Frank Moorman (AEF Radio Intel) was born.
2001: al-Qaeda Attacks in U.S.
1918: U.S. Offensive on the Saint-Mihiel
1940: Army & Navy Joint Exploitation of PURPLE
1946: Elizebeth Friedman departs the U.S. Coast Guard.
2015: President Obama visited NSA to thank the workforce.
1994: Death of Charles Tevis - first DEFSMAC director
14 15 16 17 18 19 20
1945: Signal Security Agency becomes ASA
1971: Cryptologic Pioneer Agnes Driscoll Died
1967: David Kahn's book, "The Codebreakers" was published.
1947: USAF Established
1956: First Civilian NSA Deputy Director Joseph Ream
1983: Three Inventors Receive Patent for Encryption Algorithm RSA
1892: Birth of Philip Johnston - whose idea to use the Navajo language as a code during WWII would save countless lives.
21 22 23 24 25 26 27
1957: First NSA Open House
1980: Iran-Iraq War Began
1780: Treasonous Ciphered Letter
1891: American Cryptologic Pioneer William Friedman Born
1918: "Colorado" Field Code Issued
1918: Meuse-Argonne Offensive
1940: Purple Analog #1 Started Decryption
1807: Alfred Vail, Telegraph Co-Inventor Born
1967: First Vice-Presidential Visit to NSA
1986: President Reagan Dedicated NSA Ops Bldgs
28 29 Sep 30 Oct 1 2 3 4
1978: Fort Meade Protective Service
1924: Edward Hebern Received Patent
1953: Frank Moorman Died
Monday, September 1, 2025
Tuesday, September 2, 2025
Thursday, September 4, 2025
Friday, September 5, 2025
Saturday, September 6, 2025
Sunday, September 7, 2025
Tuesday, September 9, 2025
Wednesday, September 10, 2025
Thursday, September 11, 2025
Friday, September 12, 2025
Monday, September 15, 2025
Tuesday, September 16, 2025
Wednesday, September 17, 2025
Thursday, September 18, 2025
Friday, September 19, 2025
Saturday, September 20, 2025
Sunday, September 21, 2025
Monday, September 22, 2025
Tuesday, September 23, 2025
Wednesday, September 24, 2025
Thursday, September 25, 2025
Friday, September 26, 2025
Saturday, September 27, 2025
Monday, September 29, 2025
Tuesday, September 30, 2025

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