national security agency journal articles world war ii german ...

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have permitted the solution of a dozen or so would have
taken too many cryptanalysts away from work that,
though lower in echelon, was more certain of results. So
the Germans did not seek to crack these high-level
messages, and after a while they even gave up intercepting
them. This was their unacknowledged admission ofdefeat
in the most vital sector of the secret war.
David Kahn is the leading authority on cryptology in
America, outside of Government Service. He has served
as president of the American Cryptogram Association and
the New York Cipher Society. A member of the faculty of
New York University, he is the author of technical and
popular articles on cryptology and of The Codebreakers
(1967) and the recently published Hitler's Spies.
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