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Cryptography was 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, was much advanced.
Probably the most important cryptographic event of the war was the successful decryption by the Allies of the German "Enigma" Cipher. This was accomplished initially by Poland, with the technology transferred to the French and British Allies before the outbreak of the war. The techniques were substantially improved primarily by British efforts at the Bletchley Park research station during the war. Decryption of the Enigma Cipher allowed the allies to read significant portions of the encoded German radio traffic and was an invaluable source of military intelligence throughout the war.
[edit] France
[edit] Germany
[edit] Poland
[edit] Sweden
[edit] United Kingdom
[edit] United States
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