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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 2026

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S M T W T F S
30 Aug 31 Sep 1 2 3 4 5
1943: First Bombe to Nebraska Ave.
1918: Hudson Field Code
1968: "Star Trek: The Enterprise Incident"
1972: 11 Israeli Olympic athletes & German policeman killed.
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
6 7 8 9 10 11 12
1941: Winston Churchill Visited Bletchley Park
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
13 14 15 16 17 18 19
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
1892: Birth of Philip Johnston - whose idea to use the Navajo language as a code during WWII would save countless lives.
20 21 22 23 24 25 26
1983: Three Inventors Receive Patent for Encryption Algorithm RSA
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
1807: Alfred Vail, Telegraph Co-Inventor Born
1967: First Vice-Presidential Visit to NSA
1986: President Reagan Dedicated NSA Ops Bldgs
27 28 29 Sep 30 Oct 1 2 3
1940: Purple Analog #1 Started Decryption
1978: Fort Meade Protective Service
1924: Edward Hebern Received Patent
1953: Frank Moorman Died
Tuesday, September 1, 2026
Wednesday, September 2, 2026
Friday, September 4, 2026
Saturday, September 5, 2026
Sunday, September 6, 2026
Monday, September 7, 2026
Wednesday, September 9, 2026
Thursday, September 10, 2026
Friday, September 11, 2026
Saturday, September 12, 2026
Tuesday, September 15, 2026
Wednesday, September 16, 2026
Thursday, September 17, 2026
Friday, September 18, 2026
Saturday, September 19, 2026
Sunday, September 20, 2026
Monday, September 21, 2026
Tuesday, September 22, 2026
Wednesday, September 23, 2026
Thursday, September 24, 2026
Friday, September 25, 2026
Saturday, September 26, 2026
Sunday, September 27, 2026
Tuesday, September 29, 2026
Wednesday, September 30, 2026

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