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.

June 2025

This Month

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Jun 1	2	3	4	5	6	7
1944: Jargon Code Message Announced D-Day Invasion		1989: Chinese troops crushed protestors in Tianamen Square.	1944: U-505 Captured by U.S. Navy Task Group.	1969: USAF RC-135E "Rivet Amber" was lost over the Bering Sea.	1944: D-Day	1991: Joseph Mauborgne, code and cipher expert & WWI Army Signal Corps Officer died.
1931: Herbert Yardley's "The American Black Chamber" was released.			1942: Battle of Midway began.	1918: BG Marlborough Churchill became Chief, MID.		1954: Death of Alan Turing, famed mathematician and cryptologist
				1967: Six-day War began in Mideast.

8	9	10	11	12	13	14
1999: NATO and Yugoslavia Signed Accord.		1917: U.S. Army MI-8 Established.	1941: Herbert O. Yardley hired by Canada's National Research Council.	1862: J.E.B. Stewart began his infamous ride around McClellan's Army of the Potomac	Publication of Brownell Committee Report - laid foundation for NSA.	1942: Signal Intelligence Service took possession of Arlington Hall.
1967: USS Liberty attacked by Israeli forces.

15	16	17	18	19	20	21
		2014: ATF honors Elizebeth Friedman	1979: Presidents Carter and Brezhnev signed SALT II Treaty.	1963: US-USSR agreed to "hotline."		1843: Publication of first installments of "The Gold Bug" by Poe
				1934: Communications Act of 1934 signed by President Roosevelt

22	23	24	25	26	27	28
1960: GRAB, first reconnaissance satellite, launched.	1955: ASA assumes duties from Signal Corps.	1918: "Potomac Code" was issued.	1950: North Korean invasion of South Korea.		1860: Albert J. Myer, developer of flag "wig-wag" code appointed Signal Officer.	2007: Commissioning of Coast Guard Cryptologic Group at NSA.
	1976: Diffie and Hellman presented public-key exchange idea.		1966: New NSA Headquarters building was dedicated.			1968: USS Liberty was decommissioned.
			1532: Hernan Cortes Letters - first known use of cryptography in New World.

29	Jun 30	Jul 1	2	3	4	5
1942: Allies realized code was broken by Germans.	1971: Two Rock Ranch (WWII monitoring station) closed.
1998: Frank Rowlett, cryptologic pioneer, died.

1989: Chinese troops crushed protestors in Tianamen Square.

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1944: D-Day

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1991: Joseph Mauborgne, code and cipher expert & WWI Army Signal Corps Officer died.

All Day
1954: Death of Alan Turing, famed mathematician and cryptologist

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1917: U.S. Army MI-8 Established.

All Day

1941: Herbert O. Yardley hired by Canada's National Research Council.

All Day

1862: J.E.B. Stewart began his infamous ride around McClellan's Army of the Potomac

All Day

Publication of Brownell Committee Report - laid foundation for NSA.

All Day

1942: Signal Intelligence Service took possession of Arlington Hall.

All Day

2014: ATF honors Elizebeth Friedman

All Day

1979: Presidents Carter and Brezhnev signed SALT II Treaty.

All Day

1843: Publication of first installments of "The Gold Bug" by Poe

All Day

1960: GRAB, first reconnaissance satellite, launched.

All Day

1918: "Potomac Code" was issued.

All Day

1860: Albert J. Myer, developer of flag "wig-wag" code appointed Signal Officer.

All Day

1971: Two Rock Ranch (WWII monitoring station) closed.

All Day

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