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U.S. Army Signals Intelligence Service cryptologists, mostly women, at work at Arlington Hall circa 1943. The Code Girls or World War II Code Girls is a nickname for the more than 10,000 women who served as cryptographers (code makers) and cryptanalysts (code breakers) for the United States Military during World War II, working in secrecy to break German and Japanese codes.
Cryptography was used extensively during World War II because of the importance of radio communication and the ease of radio interception. The nations involved fielded a plethora of code and cipher systems, many of the latter using rotor machines. As a result, the theoretical and practical aspects of cryptanalysis, or codebreaking, were much ...
Betty Webb (code breaker) served in the ATS (Auxiliary Territorial Service) then moved to Bletchley Park to help decipher Japanese and German encrypted messages; Neil Leslie Webster, major in SIXTA, signals intelligence and codebreaking
On entering World War II in June 1940, the Italians were using book codes for most of their military messages. The exception was the Italian Navy , which after the Battle of Cape Matapan started using the C-38 version of the Boris Hagelin rotor-based cipher machine , particularly to route their navy and merchant marine convoys to the conflict ...
About 7,500 women worked in Bletchley Park, the central site for British cryptanalysts during World War II.Women constituted roughly 75% of the workforce there. [1] While women were overwhelmingly under-represented in high-level work such as cryptanalysis, they were employed in large numbers in other important areas, including as operators of cryptographic and communications machinery ...
Joseph John Rochefort (May 12, 1900 [1] – July 20, 1976) was an American naval officer and cryptanalyst.He was a major figure in the United States Navy's cryptographic and intelligence operations from 1925 to 1946, particularly in the Battle of Midway.
British codebreakers, including Alan Turning, were based at the site during the war and fed crucial information to Allied forces ahead of D-Day.
The British Naval Cypher No. 5 is also known to have been broken by the B-Dienst, as were various low-grade British Naval and Air codes, including COFOX, MEDOX, FOXO, LOXO, SYKO, Air Force code and Aircraft Movement code. The US "Hagelin" M-209 field cipher machine and the French "Anglp" [clarification needed] code were also often read.