Cryptologic Dates in History Calendar

"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

This Month

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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.

1940: "Odd/Even" Agreement for Army & Navy

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1942: Army Transfers Cryptographic Division School

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1973: Yom Kippur War in Middle East Began.

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1985: U.S. Fighters Intercept Terrorists from "Achille Lauro"

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1946: Vint Hill Farms School Renamed

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1964: People's Republic of China Detonated First Nuclear Weapon

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1907: First Commercial Transatlantic Wireless Service

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1962: President Kennedy ordered a naval quarantine of Cuba

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1893: Laurance Safford born.

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1983: Terrorists at Marine Compound in Beirut

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1992: Center for Cryptologic History Published "The Friedman Legacy"

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