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  2. World War II cryptography - Wikipedia

    en.wikipedia.org/wiki/World_War_II_cryptography

    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 ...

  3. Magic (cryptography) - Wikipedia

    en.wikipedia.org/wiki/Magic_(cryptography)

    In 1923, a US Navy officer acquired a stolen copy of the Secret Operating Code codebook used by the Imperial Japanese Navy during World War I. Photographs of the codebook were given to the cryptanalysts at the Research Desk and the processed code was kept in red-colored folders (to indicate its Top Secret classification). This code was called ...

  4. Japanese naval codes - Wikipedia

    en.wikipedia.org/wiki/Japanese_naval_codes

    This was a naval code used by merchant ships (commonly known as the "maru code"), [22] broken in May 1940. 28 May 1941, when the whale factory ship Nisshin Maru No. 2 (1937) visited San Francisco, U.S. Customs Service Agent George Muller and Commander R. P. McCullough of the U.S. Navy's 12th Naval District (responsible for the area) boarded her ...

  5. Enigma machine - Wikipedia

    en.wikipedia.org/wiki/Enigma_machine

    It was employed extensively by Nazi Germany during World War II, in all branches of the German military. The Enigma machine was considered so secure that it was used to encipher the most top-secret messages. [1] The Enigma has an electromechanical rotor mechanism that scrambles the 26 letters of the alphabet. In typical use, one person enters ...

  6. Cryptanalysis of the Enigma - Wikipedia

    en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma

    The British read unsteckered Enigma messages sent during the Spanish Civil War, [15] and also some Italian naval traffic enciphered early in World War II. The strength of the security of the ciphers that were produced by the Enigma machine was a product of the large numbers associated with the scrambling process.

  7. German code breaking in World War II - Wikipedia

    en.wikipedia.org/wiki/German_code_breaking_in...

    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.

  8. Ultra (cryptography) - Wikipedia

    en.wikipedia.org/wiki/Ultra_(cryptography)

    A 2012 London Science Museum exhibit, "Code Breaker: Alan Turing's Life and Legacy", [102] marking the centenary of his birth, includes a short film of statements by half a dozen participants and historians of the World War II Bletchley Park Ultra operations. John Agar, a historian of science and technology, states that by war's end 8,995 ...

  9. Japanese army and diplomatic codes - Wikipedia

    en.wikipedia.org/wiki/Japanese_army_and...

    Code Girls: The Untold Story of the American Women Code Breakers of World War II. New York, Boston: Hachette Books. ISBN 978-0-316-35253-6., Chapter 10. Smith, Michael (2000). The Emperor's Codes: Bletchley Park and the breaking of Japan's secret ciphers. London: Bantam Press. ISBN 0593-046412.