William Frederick Friedman (1891-1969), pictured in 1924, was a pioneering American cryptologist who became the chief cryptoanalyst in the Signal Intelligence Service of the War Department, notably leading the teams during WWII that broke various Japanese codes, including ultimately the Purple machine cipher initiated by Japan in 1939. Friedman was married to another notable pioneering cryptologist, Elizebeth Smith Friedman.

GLIX-115-W3WH11

William Frederick Friedman (1891-1969), pictured in 1924, was a pioneering American cryptologist who became the chief cryptoanalyst in the Signal Intelligence Service of the War Department, notably leading the teams during WWII that broke various Japanese codes, including ultimately the Purple machine cipher initiated by Japan in 1939. Friedman was married to another notable pioneering cryptologist, Elizebeth Smith Friedman.
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Alpha Historica

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United States.

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William Frederick Friedman (1891-1969), pictured in 1924, was a pioneering American cryptologist who became the chief cryptoanalyst in the Signal Intelligence Service of the War Department, notably leading the teams during WWII that broke various Japanese codes, including ultimately the Purple machine cipher initiated by Japan in 1939. Friedman was married to another notable pioneering cryptologist, Elizebeth Smith Friedman.

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