Ratcliff, R. A <br/><br/>
Delusions of intelligence : Enigma, Ultra and the end of secure ciphers 
R. A. Ratcliff 
 - Cambridge ; New York  Cambridge University Press  2006 
 - xvii, 314 p. : ill. ; 24 cm 
<br/><br/> Includes bibliographical references (p. 287-303) and index 
<br/><br/><label>ISBN: </label>9780521855228 
<br/><br/><label>ISSN: </label>2005036466 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Enigma cipher system<br/>ULTRA (Intelligence system)<br/>World War, 1939-1945 - Cryptography<br/>World War, 1939-1945 - Electronic intelligence - Germany<br/>World War, 1939-1945 - Electronic intelligence - Great Britain
<br/><br/><label>Dewey Class. No.: </label>940.548743 RAT