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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.

September 2031

This Month

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Sep 1	2	4	6
1983: KAL 007 Shot Down	1918: Hudson Field Code	1968: "Star Trek: The Enterprise Incident"	1941: Winston Churchill Visited Bletchley Park
1939: Army's SIS Translates PURPLE	1945: Japanese Surrender Event
1943: First Bombe to Nebraska Ave.	1997: National Vigilance Park Dedicated
	1958: C-130 Shot Down

7	9	10	11	12
1983: Inventor Boris Hagelin Died.	1947: Grace Hopper & the First Computer "Bug"	1877: Frank Moorman (AEF Radio Intel) was born.	2001: al-Qaeda Attacks in U.S.	1918: U.S. Offensive on the Saint-Mihiel
			1940: Army & Navy Joint Exploitation of PURPLE	1946: Elizebeth Friedman departs the U.S. Coast Guard.
				1994: Death of Charles Tevis - first DEFSMAC director

14	15	16	17	18	19	20
	1945: Signal Security Agency becomes ASA	1971: Cryptologic Pioneer Agnes Driscoll Died	1967: David Kahn's book, "The Codebreakers" was published.	1947: USAF Established	1956: First Civilian NSA Deputy Director Joseph Ream	1983: Three Inventors Receive Patent for Encryption Algorithm RSA
			1892: Birth of Philip Johnston - whose idea to use the Navajo language as a code during WWII would save countless lives.

21	22	23	24	25	26	27
		1780: Treasonous Ciphered Letter	1891: American Cryptologic Pioneer William Friedman Born	1918: "Colorado" Field Code Issued	1967: First Vice-Presidential Visit to NSA	1940: Purple Analog #1 Started Decryption
				1807: Alfred Vail, Telegraph Co-Inventor Born