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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.

March 2025

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S M T W T F S
23 24 25 26 27 Feb 28 Mar 1
1917: Zimmermann Telegram released to U.S. press.
1918: German ADFGVX cipher first used.
1930: First hire at SIS - Annie Louise Newkirk
1951: Shelby Patterson became chief of the AFSA school.
1971: Loss of Army UH-1 & its crew.
2 3 4 5 6 7 8
1971: Cryptologic Pioneer Colonel Parker Hitt.
1832: Death of Jean-François Champollion.
1942: Station HYPO began reading Japanese system JN-25.
1924: William Friedman testifies re: Teapot Dome scandal.
1973: 509th Radio Research Group was resubordinated.
1953: "Direct" SIGINT support to tactical air control center began on Cho Do Island.
1971: Army RU-8 shot down, Vietnam.
1946: BRUSA Communications Intelligence Agreement
1969: Death of Ralph J. Canine, first DIRNSA.
1975: STONEHOUSE site officially closed.
1954: USAFSS started Airborne Reconnaissance Program
9 10 11 12 13 14 15
1967: USAF EC-47 loss in Vietnam.
1876: First successful voice transmission over Bell's telephone.
1935: Navy cryptologic organization redesignated OP-20-G as Communications Security Group.
1951: AFSA Training Branch Established
1951: Seoul, South Korea, recaptured by UN forces.
1946: CREAM replaced ULTRA.
1918: Radio Intelligence Service, Mexican border, was established.
1942: Evacuation of Station CAST.
1981: USAF RC-135 lost, Shemya.
16 17 18 19 20 21 22
1974: Horst Feistel received a patent for "Block Cipher Cryptographic System."
1938: SIS started receiving messages from Purple.
1962: ASA flew first airborne radio direction finding mission in Vietnam.
2003: Operation Iraqi Freedom began.
23 24 25 26 27 28 29
1999: NATO began Operation ALLIED FORCE in Kosovo.
1999: Lt Gen Michael Hayden, USAF, became DIRNSA.
1994: Griffiss Air Force Base finds malware
Vietnam Veterans Day
30 Mar 31 Apr 1 2 3 4 5
1938: Chief Signal Officer Mauborgne permitted to perform intercept and cryptologic services for peacetime training.
1973: Last U.S. troops left Vietnam.
Saturday, March 1, 2025
Sunday, March 2, 2025
Tuesday, March 4, 2025
Wednesday, March 5, 2025
Thursday, March 6, 2025
Friday, March 7, 2025
Saturday, March 8, 2025
Sunday, March 9, 2025
Monday, March 10, 2025
Tuesday, March 11, 2025
Wednesday, March 12, 2025
Friday, March 14, 2025
Saturday, March 15, 2025
Wednesday, March 19, 2025
Thursday, March 20, 2025
Saturday, March 22, 2025
Monday, March 24, 2025
Wednesday, March 26, 2025
Friday, March 28, 2025
Saturday, March 29, 2025
Sunday, March 30, 2025

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