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.

April 2025

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30	Mar 31	Apr 1	2	3	4	5
		1952: U.S. Navy's crypto org becomes Naval Security Group.	1872: Painter & inventor Samuel Morse died.	1973: Motorola completed the first handheld cellular phone call.		1929: Sec of War created the Signal Corps - Signals Intelligence Service.
		1981: Lt Gen Lincoln D. Faurer, USAF, became Director of NSA.		1907: Cryptologic pioneer Solomon Kullback was born.		1918: French Army Lt Georges Painvin solved the first key for the ADFGVX cipher.
		2001: Hainan Island incident involving Navy EP-3
		2014: ADM Michael S. Rogers, USN, sworn in at NSA
		1930: Frank Rowlett Goes to Work for William Friedman

6	7	8	9	10	11	12
1917: U.S. entered World War I.	1882: Birth of Hermann Pokorny, founder of the Hungarian cryptanalytic service.	2003: Baghdad fell to Coalition forces.			1930: Abraham Sinkov reported to work at SIS.	2001: China Released 24 USN EP3 Crewmen.
1943: First break in the Japanese Water Transport Code.	1945: The "Yamato" sunk off Okinawa, largely due to SIGINT tipoffs.	1950: Navy PB4Y-2 Privateer Patrol Bomber Shot Down.
	1964: IBM Introduced the System/360

13	14	15	16	17	18	19
1943: FRUPAC Intercepted Yamamoto's Encoded Itinerary.	1969: "Der Spiegel" Reported on Computer Espionage	1942: Central Bureau Established	1993: Clinton administration proposed "Clipper Chip" method	1942: Station HYPO Intercepts Revealed Japanese Plans for Attack.	1943: Shootdown of Admiral Yamamoto.	1862: Confederate Signal Corps Established.
1889: Herbert O. Yardley's birth date.	1986: President Reagan Ordered Airstrikes Against Terrorists in Libya.	1969: Navy EC-121 Shot Down.		1961: Bay of Pigs Landing.	1967: NSA Experts Spoke in Public on Computer Security at Atlantic City Conference.

20	21	22	23	24	25	26
	1974: Louis Tordella Retired as D/DIRNSA	1944: Gen MacArthur Attacked Hollandia, New Guinea	1869: Birthday of Cryptologic Machine Designer, Edward Hebern.	1980: Attempt to Rescue U.S. Hostages in Iran Failed.	1874: Radio Pioneer Guglielmo Marconi was Born.
		1930: Solomon Kullback Reported to SIS to work for William Friedman.

27	28	29	Apr 30	May 1	2	3
1791: Samuel Morse Was Born.		1985: SECAF approved women for duty on EC-130 aircraft.	1965: National Cryptologic School Approved
2007: Estonia Suffered Mass Cyber Attack.
1964: DEFSMAC Established.

1872: Painter & inventor Samuel Morse died.

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1929: Sec of War created the Signal Corps - Signals Intelligence Service.

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1918: French Army Lt Georges Painvin solved the first key for the ADFGVX cipher.

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1930: Abraham Sinkov reported to work at SIS.

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2001: China Released 24 USN EP3 Crewmen.

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1993: Clinton administration proposed "Clipper Chip" method

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1862: Confederate Signal Corps Established.

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1974: Louis Tordella Retired as D/DIRNSA

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1869: Birthday of Cryptologic Machine Designer, Edward Hebern.

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1980: Attempt to Rescue U.S. Hostages in Iran Failed.

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1874: Radio Pioneer Guglielmo Marconi was Born.

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1985: SECAF approved women for duty on EC-130 aircraft.

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1965: National Cryptologic School Approved

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