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William Frederick Friedman (1891-1969), US cryptologist. Friedman was born in Russia and grew up in Pittsburgh, USA, from 1893. He studied at Cornell University and then worked at Riverbank Laboratories near Chicago. Here, he developed his interest in codes and ciphers. During World War I, he was a cryptologic officer. After the war became chief of the Signals Intelligence Service (SIS). He played a key role in deciphering codes for the US military during World War II. In 1952, he became chief cryptologist for the new National Security Agency (NSA) and wrote many cryptology textbooks. Friedman was awarded the National Security Medal in 1956.
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