World War II cryptography

Cryptography as used extensively during World War II, with a plethora of code and cipher systems fielded by the nations involved. In addition, the theoretical and practical aspects of cryptanalysis, or codebreaking, were much advanced.

Probably the most important codebreaking event of the war was the successful decryption by the Allies of the German "Enigma" Cipher. The first complete break into Enigma was accomplished by Poland around 1932; the techniques and insights used were passed to the French and British Allies just before the outbreak of the war in 1939. They were substantially improved by British efforts at the Bletchley Park research station during the war. Decryption of the Enigma Cipher allowed the Allies to read important parts of German radio traffic on important networks and was an invaluable source of military intelligence throughout the war. Intelligence from this source (and other high level sources, including the Fish ciphers) was eventually called Ultra.[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.

Australia

Finland

France

Germany

Italy

Japan

Poland

Soviet Union

Sweden

United Kingdom

United States
gollark: Looks like an artifact of scaling it.
gollark: I mean, it's 256x256, so it might look "squarey" if it's being upscaled.
gollark: As you can see, it does not look good.
gollark: It took an annoyingly long time to work out how to generate this, but here's an example of an entirely random image.
gollark: I... don't think so, randomly generating images would be trivial and look bad.

See also

References
  1. Budiansky, Stephen (2000). Battle of Wits: The Complete Story of Codebreaking in World War II. Simon and Schuster. ISBN 9780684859323.
  2. Hinsley, F. H.; Stripp, Alan (2001). Codebreakers: The Inside Story of Bletchley Park. Oxford University Press. ISBN 9780192801326.
  3. Haufler, Hervie (2014). Codebreakers' Victory: How the Allied Cryptographers Won World War II. Open Road Media. ISBN 9781497622562.
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