David Kahn is author of the best-selling The Codebreakers: The Story of Secret Writing, Hitler's Spies: German Military Intelligence in World War II, Seizing the Enigma: The Race to Beat the German U-Boat Codes, and Kahn on Codes: Secrets of the New Cryptology.
"Yardley was both a patriot and a self-serving entrepreneur, and his life raises moral questions as much as it illustrates the history of cryptography. Kahn's biography of Yardley is fascinating reading." Harvey Klehr, coauthor of The Secret World of American Communism and The Soviet World of American Communism."
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