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World War II cryptography
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==United States== * [[Magic (cryptography)]] * [[Signals Intelligence Service]] US Army, see also [[Arlington Hall]] * [[OP-20-G]] US Navy Signals Intelligence group * [[Elizebeth Smith Friedman]] * [[William Friedman]] * [[Frank Rowlett]] * [[Abraham Sinkov]] * [[Genevieve Grotjan Feinstein]] * [[Leo Rosen]] * [[Joseph Rochefort]], leader of the effort to crack Japanese Naval codes * [[Joseph Mauborgne]] * [[Agnes Meyer Driscoll]] * [[SIGABA]] cipher machine * [[SIGSALY]] voice encryption * [[SIGTOT]] one-time tape system * [[M-209]] cipher machine * [[Station HYPO]] cryptanalysis group * [[Station CAST]] cryptanalysis group * [[Station NEGAT]]
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