David Kahn, a historian of intelligence, particularly of communications intelligence, or codebreaking, is widely regarded as the world’s leading expert on the history of codes and cryptology. His ...
THE CODEBREAKERS by David Kahn. 1,164 pages. Macmillan. $14.95. In his letters to Cicero, Julius Caesar employed a cipher in which each character was replaced by one standing three places down the ...
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