<P>David Kahn is universally regarded as the dean of intelligence historians. Recounting the desperate efforts to gather information during World War II and the Cold War, he provides insight into the dark realm of intelligence and code that will fascinate cryptographers, intelligence personnel, and the millions interested in military history, espionage adventure, and world affairs. By revealing the past, the book helps guide present and future intelligence efforts. Kahn is the author of <I>The Codebreakers </I>and <I>Seizing the Enigma: The Race to Break the German U-Boats Codes, 1939-1943</I>, which was the basis for the movie <I>U-571.</P></I>