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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.

January 2027

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S M T W T F S
27 28 29 30 Dec 31 Jan 1 2
1599: Birth date of Antoine Rossignol
1980: NSA Office of Policy mandated use of term "Service Cryptologic Element."
1921: William Friedman began 6 month contract with Army Signal Corps
1962: Lt Gen Gordon A. Blake, USAF, became DIRNSA.
1977: U.S. Army Intelligence and Security Command established.
3 4 5 6 7 8 9
1977: NARA assigned Record Group 457 to declassified NSA records.
1957: MG Gordon Blake named Commander, AF Security Service
1924: Laurance Safford named OIC, Navy Cryptographic Branch.
1838: Alfred Vail uses dots & dashes
1942: Jerzy Różycki, Polish Cipher Bureau mathematician, died.
1962: Marine cryptologists in Vietnam.
10 11 12 13 14 15 16
1996: Louis Tordella, long-time D/DIRNSA died.
2003: First "History Today" article on NSA Daily Page.
1944: BRUSA Agreement
1977: 56-bit Data Encryption Standard published.
1898: Publication of a new War Department Telegraphic Code was authorized.
1978: Brig Gen Ardisana Died on this Date
17 18 19 20 21 22 23
1917: Zimmermann Telegram
1859: Alfred Vail, co-inventor of the telegraph, died.
1944: 9th Infantry Division of the Australian Army captured Japanese cryptographic library.
1981: Iran released U.S. hostages.
1988: DIRNSA and OPSEC training.
1941: Eligible readers of "Magic" intercept are established.
1991: Operation DESERT STORM began.
1918: German spy Lothar Witzke was arrested carrying a coded message.
1998: U.S. cryptologic pioneer Abraham Sinkov died.
1968: North Koreans captured USS Pueblo.
24 25 26 27 28 29 30
1918: Arthur Scherbius received patent for ENIGMA.
1987: Navy EA-3B recon aircraft crashed in the Mediterranean Sea.
1973: Paris Peace Accords signed.
28 Jan 1986: Remembering the Challenger and her Crew
1943: New Zealand corvettes disable Japanese submarine and seize codebooks.
1968: Tet offensive in Vietnam began.
1915: Battle Of Dogger Bank
1975: Church Committee began investigation of U.S. Intelligence Community.
Jan 31 Feb 1 2 3 4 5 6
1992: 'The Federal Register' published details for the Secure Hash Standard (SHA).
Friday, January 1, 2027
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Wednesday, January 27, 2027
Thursday, January 28, 2027
Friday, January 29, 2027
Saturday, January 30, 2027
Sunday, January 31, 2027

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