Churchhouse, R. F. <br/><br/>
Codes and ciphers: Julius Caesar, the Enigma and the internet  Julius Caesar, the Enigma and the internet 
R.F. Churchhouse. 
 - Cambridge ;  New York :  Cambridge University Press,  2002. 
 - x, 240 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0521008905 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography.<br/>Ciphers.
<br/><br/><label>Dewey Class. No.: </label>652.8