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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.

November 2025

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S M T W T F S
26 27 28 29 30 Oct 31 Nov 1
1919 Britain's Government Code & Cypher School Established
1942 COMINT Station Established on Guadalcanal
1953: First NSA Newsletter
2 3 4 5 6 7 8
1969: William Friedman died.
1952: NSA Established. LTG Ralph Canine, Director.
1918: The "Seneca" field code was released.
1944: Captain Joseph Wenger became head of OP-20-G.
9 10 11 12 13 14 15
1989: Fall of Berlin wall began.
1918: Armistice signed ending WWI.
1917: AEF Radio Intelligence Section opened intercept site at Souilly, France.
1895: Ralph J. Canine, first DIRNSA was born.
1918: 1st Fixed U.S. Field Station in Houlton, ME.
16 17 18 19 20 21 22
1912: Herbert O. Yardley hired as State Department code clerk.
1989: Center for Cryptologic History was established.
1970: Attempt to rescue POWs from North Vietnam.
1969: First permanent ARPANET link established.
1941: Herbert Yardley fired by Canada's National Research Council.
1921: W. Friedman appointed Chief Cryptanalyst for the Signal Corps
23 24 25 26 27 28 29
1976: Data Encryption Standard Approved
1956: Lt Gen John A. Samford, USAF, became DIRNSA.
1986: Ronald Pelton, former NSA analyst, arrested for spying.
1957: Lt Gen Samford Officially Opened the NSA OPS1 Building
1960: VADM Laurence Frost, USN, became DIRNSA.
1616: Birth date of John Wallis
1866: First Encoded American Diplomatic Telegram
Nov 30 Dec 1 2 3 4 5 6
Saturday, November 1, 2025
Sunday, November 2, 2025
Tuesday, November 4, 2025
Thursday, November 6, 2025
Sunday, November 9, 2025
Tuesday, November 11, 2025
Wednesday, November 12, 2025
Sunday, November 16, 2025
Monday, November 17, 2025
Thursday, November 20, 2025
Friday, November 21, 2025
Saturday, November 22, 2025
Sunday, November 23, 2025
Monday, November 24, 2025
Tuesday, November 25, 2025

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