Elizebeth Friedman | The Codebreaker | American Experience | PBS
William Friedman | The Codebreaker | American Experience | PBS
How to pronounce William F Friedman (Romanian/Romania) - PronounceNames.com
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William Frederick Friedman was a US Army cryptographer who ran the research division of the Army's Signal 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.