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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.

April 2027

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28 29 30 Mar 31 Apr 1 2 3
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
4 5 6 7 8 9 10
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.
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
11 12 13 14 15 16 17
1930: Abraham Sinkov reported to work at SIS.
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: 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.
18 19 20 21 22 23 24
1943: Shootdown of Admiral Yamamoto.
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.
1967: NSA Experts Spoke in Public on Computer Security at Atlantic City Conference.
1944: Gen MacArthur Attacked Hollandia, New Guinea
25 26 27 28 29 Apr 30 May 1
1874: Radio Pioneer Guglielmo Marconi was Born.
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.
Thursday, April 1, 2027
Friday, April 2, 2027
Saturday, April 3, 2027
Monday, April 5, 2027
Tuesday, April 6, 2027
Wednesday, April 7, 2027
Thursday, April 8, 2027
Sunday, April 11, 2027
Monday, April 12, 2027
Tuesday, April 13, 2027
Wednesday, April 14, 2027
Thursday, April 15, 2027
Friday, April 16, 2027
Saturday, April 17, 2027
Sunday, April 18, 2027
Monday, April 19, 2027
Wednesday, April 21, 2027
Thursday, April 22, 2027
Friday, April 23, 2027
Saturday, April 24, 2027
Sunday, April 25, 2027
Tuesday, April 27, 2027
Thursday, April 29, 2027
Friday, April 30, 2027

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