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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.

October 2025

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S M T W T F S
28 29 Sep 30 Oct 1 2 3 4
1919: The American "Black Chamber" began operations.
1780: British Major John André Hanged As a Spy
1940: "Odd/Even" Agreement for Army & Navy
1949: AFSA Assumed Cryptologic Activities
1942: Signing of Holden Agreement
1986: NSA Protective Service established.
5 6 7 8 9 10 11
1942: Army Transfers Cryptographic Division School
1973: Yom Kippur War in Middle East Began.
1918: "Champlain" Field Codes Released.
1985: U.S. Fighters Intercept Terrorists from "Achille Lauro"
1952: USAF RB-29 Shot Down
2001: "Operation Enduring Freedom" Began.
12 13 14 15 16 17 18
1955: William Friedman Awarded National Security Medal
1946: Vint Hill Farms School Renamed
1964: People's Republic of China Detonated First Nuclear Weapon
1907: First Commercial Transatlantic Wireless Service
2000: al-Qaeda Bomed the USS Cole
19 20 21 22 23 24 25
1875: Charles Wheatstone Died.
1948: Air Force Security Service Established
1962: President Kennedy ordered a naval quarantine of Cuba
1893: Laurance Safford born.
1983: Terrorists at Marine Compound in Beirut
1952: Memorandum from President Truman re: COMINT and NSA
1983: U.S. Forces Landed in Grenada During Operation Urgent Fury
1948: Lamphere-Gardner VENONA Collaboration Began.
1981: Foreign Intelligence Advisory Board Re-established.
1957: Dr. James Killian Submits Influential Report on Defense and Intelligence
2003: Death of Dr. Richard Leibler
1945: United Nations came into existence.
26 27 28 29 30 Oct 31 Nov 1
1918: First Combat Employment of Choctaw Codetalkers
1861: Lincoln Approved Military Telegraph Department
1917: First U.S. Intercept in France in WWI
1992: Center for Cryptologic History Published "The Friedman Legacy"
1737: Birthday of James Lovell
2010: National Cryptologic Museum Recognizes Dr. David Kahn
1918: The "Osage" Field Code Was Released.
1969: 1st Message Sent on DoD ARPANET
1980: Elizebeth Friedman Died.
1977: Lambros Callimahos Died.
2010: U.S. Cyber Command at Ft. Meade
1929: Cipher Bureau Closed.
Wednesday, October 1, 2025
Thursday, October 2, 2025
Friday, October 3, 2025
Sunday, October 5, 2025
Monday, October 6, 2025
Tuesday, October 7, 2025
Thursday, October 9, 2025
Sunday, October 12, 2025
Wednesday, October 15, 2025
Thursday, October 16, 2025
Friday, October 17, 2025
Sunday, October 19, 2025
Monday, October 20, 2025
Tuesday, October 21, 2025
Wednesday, October 22, 2025
Thursday, October 23, 2025
Friday, October 24, 2025
Saturday, October 25, 2025
Sunday, October 26, 2025
Tuesday, October 28, 2025
Wednesday, October 29, 2025
Thursday, October 30, 2025
Friday, October 31, 2025

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