Close
Menu

Cryptologic Bytes

Every little bit helps the NCF to influence the cryptologic future by sharing our educational resources, stimulating new knowledge, and commemorating our heritage.

"On This Date in Cryptologic History" Calendar

Learn about a wide variety of historical events related to cryptology, computers, math, cybersecurity, Intelligence, and more.

October 2026

This Month
Select a Date to View
Jump to a Month
Month
Year
Go to Previous Go to Next
S M T W T F S
27 28 29 Sep 30 Oct 1 2 3
1919: The American "Black Chamber" began operations.
1780: British Major John André Hanged As a Spy
1940: "Odd/Even" Agreement for Army & Navy
1949: AFSA Assumed Cryptologic Activities
1942: Signing of Holden Agreement
1986: NSA Protective Service established.
4 5 6 7 8 9 10
1942: Army Transfers Cryptographic Division School
1973: Yom Kippur War in Middle East Began.
1918: "Champlain" Field Codes Released.
1985: U.S. Fighters Intercept Terrorists from "Achille Lauro"
1952: USAF RB-29 Shot Down
2001: "Operation Enduring Freedom" Began.
11 12 13 14 15 16 17
1955: William Friedman Awarded National Security Medal
1946: Vint Hill Farms School Renamed
1964: People's Republic of China Detonated First Nuclear Weapon
1907: First Commercial Transatlantic Wireless Service
2000: al-Qaeda Bomed the USS Cole
18 19 20 21 22 23 24
1875: Charles Wheatstone Died.
1948: Air Force Security Service Established
1962: President Kennedy ordered a naval quarantine of Cuba
1893: Laurance Safford born.
1983: Terrorists at Marine Compound in Beirut
1952: Memorandum from President Truman re: COMINT and NSA
1948: Lamphere-Gardner VENONA Collaboration Began.
1981: Foreign Intelligence Advisory Board Re-established.
1957: Dr. James Killian Submits Influential Report on Defense and Intelligence
1945: United Nations came into existence.
25 26 27 28 29 30 Oct 31
1983: U.S. Forces Landed in Grenada During Operation Urgent Fury
1918: First Combat Employment of Choctaw Codetalkers
1861: Lincoln Approved Military Telegraph Department
1917: First U.S. Intercept in France in WWI
1992: Center for Cryptologic History Published "The Friedman Legacy"
1737: Birthday of James Lovell
2003: Death of Dr. Richard Leibler
2010: National Cryptologic Museum Recognizes Dr. David Kahn
1918: The "Osage" Field Code Was Released.
1969: 1st Message Sent on DoD ARPANET
1980: Elizebeth Friedman Died.
1977: Lambros Callimahos Died.
2010: U.S. Cyber Command at Ft. Meade
1929: Cipher Bureau Closed.
Thursday, October 1, 2026
Friday, October 2, 2026
Saturday, October 3, 2026
Monday, October 5, 2026
Tuesday, October 6, 2026
Wednesday, October 7, 2026
Friday, October 9, 2026
Monday, October 12, 2026
Thursday, October 15, 2026
Friday, October 16, 2026
Saturday, October 17, 2026
Monday, October 19, 2026
Tuesday, October 20, 2026
Wednesday, October 21, 2026
Thursday, October 22, 2026
Friday, October 23, 2026
Saturday, October 24, 2026
Sunday, October 25, 2026
Monday, October 26, 2026
Wednesday, October 28, 2026
Thursday, October 29, 2026
Friday, October 30, 2026
Saturday, October 31, 2026

VISIT THE ARCHIVES

Check out the Cryptologic Bytes Archives for a wide variety of articles on all topics related to cryptology, codes and ciphers, related publications, Museums, and more.