William F. Friedman
William Frederick Friedman (September 24, 1891 – November 12, 1969) was a US Army cryptographer who ran the research division of the Army's Signals Intelligence Service (SIS) in the 1930s, and parts of its follow-on services into the 1950s. In 1940, subordinates of his led by Frank Rowlett broke Japan's PURPLE cipher, thus disclosing Japanese diplomatic secrets before America's entrance into World War II.
Read more about William F. Friedman: Early Life, Initial Work in Cryptology, Signals Intelligence Service, Solution of Cipher Machines, National Security Agency, Death and Legacy, Awards and Honors, In Popular Culture
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