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The world’s leading expert in the history of cryptology (making and breaking codes and ciphers), Mr. Kahn serves as an expert commentator to the media on this topic. He has taught modern political and military intelligence at Yale and Columbia Universities and was a visiting historian with the National Security Agency. His books on cryptology and intelligence gathering include The Codebreakers; Hitler’s Spies: German Military Intelligence in World War II; and Seizing the Enigma: The Race to Break the German U-boat Codes.