Churchhouse, R. F <br/><br/>
Codes and ciphers : Julius Caesar, the Enigma, and the internet 
R.F. Churchhouse 
 - Cambridge  Cambridge University Press  2002 
 - x, 240 p. : ill. ; 24 cm 
<br/><br/> Includes bibliographical references and indexes 
<br/><br/><label>ISBN: </label>9780521008907 
<br/><br/><label>ISSN: </label>2001037409 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciphers<br/>Cryptography
<br/><br/><label>Dewey Class. No.: </label>652.8 CHU