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[1] [2] [3] A similar break into the most secure Japanese diplomatic cipher, designated Purple by the US Army Signals Intelligence Service, started before the US entered the war. Product from this source was called Magic. On the other side, German code breaking in World War II achieved some notable successes cracking British naval and other ...
The B-Dienst, created in the early 1930s, had broken the most widely used British naval code by 1935.When war came in 1939, B-Dienst specialists had broken enough British naval codes that the Germans knew the positions of all British warships.
A copy of the code book was obtained in a "black bag" operation on the luggage of a Japanese naval attaché in 1923; after three years of work Agnes Driscoll was able to break the additive portion of the code. [2] [3] [4] Knowledge of the Red Book code helped crack the similarly constructed Blue Book code. [1]
The Secret Code-Breakers of Central Bureau. Melbourne, London: Scribe. ISBN 9781925322187. Jenkins, David (1992). Battle Surface! Japan's Submarine War Against Australia 1942–44. Milsons Point NSW Australia: Random House Australia. ISBN 0-09-182638-1. Mundy, Liza (2017). Code Girls: The Untold Story of the American Women Code Breakers of ...
This is a list of known World War II era codenames for military operations and missions commonly associated with World War II. As of 2022 [update] this is not a comprehensive list, but most major operations that Axis and Allied combatants engaged in are included, and also operations that involved neutral nation states.
Patricia Davies (née Owtram; born 19 June 1923) is an English former codebreaker who served as a special duties linguist in the Women’s Royal Naval Service during World War II. She and her younger sister Jean Argles are often referred to as "The Codebreaking Sisters". [1]
A well-known sign/countersign used by the Allied forces on D-Day during World War II: the challenge/sign was "flash", the password "thunder" and the countersign (to challenge the person giving the first codeword) "Welcome". [2] Some countersigns include words that are difficult for an enemy to pronounce.
Code 3: Respond to the call using lights and sirens. Code 2: Respond to the call with lights only (rarely allowable by state statutes) Code 1: Respond to the call without lights or sirens. Some agencies may use the terms "upgrade" and "downgrade" to denote an increase or decrease in priority.