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 2026

This Month

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29	30	Mar 31	Apr 1	2	3	4
			1930: Frank Rowlett Goes to Work for William Friedman	1872: Painter & inventor Samuel Morse died.	1907: Cryptologic pioneer Solomon Kullback was born.
			1952: U.S. Navy's crypto org becomes Naval Security Group.		1973: Motorola completed the first handheld cellular phone call.
			1981: Lt Gen Lincoln D. Faurer, USAF, became Director of NSA.
			2001: Hainan Island incident involving Navy EP-3
			2014: ADM Michael S. Rogers, USN, sworn in at NSA

5	6	7	8	9	10	11
1929: Sec of War created the Signal Corps - Signals Intelligence Service.	1917: U.S. entered World War I.	1882: Birth of Hermann Pokorny, founder of the Hungarian cryptanalytic service.	1950: Navy PB4Y-2 Privateer Patrol Bomber Shot Down.			1930: Abraham Sinkov reported to work at SIS.
1918: French Army Lt Georges Painvin solved the first key for the ADFGVX cipher.	1943: First break in the Japanese Water Transport Code.	1945: The "Yamato" sunk off Okinawa, largely due to SIGINT tipoffs.	2003: Baghdad fell to Coalition forces.
		1964: IBM Introduced the System/360

12	13	14	15	16	17	18
2001: China Released 24 USN EP3 Crewmen.	1889: Herbert O. Yardley's birth date.	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.
	1943: FRUPAC Intercepted Yamamoto's Encoded Itinerary.	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.

19	20	21	22	23	24	25
1862: Confederate Signal Corps Established.		1974: Louis Tordella Retired as D/DIRNSA	1930: Solomon Kullback Reported to SIS to work for William Friedman.	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.
			1944: Gen MacArthur Attacked Hollandia, New Guinea

26	27	28	29	Apr 30	May 1	2
	1791: Samuel Morse Was Born.		1985: SECAF approved women for duty on EC-130 aircraft.	1965: National Cryptologic School Approved
	1964: DEFSMAC Established.
	2007: Estonia Suffered Mass Cyber Attack.

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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