SHEPHERD, S.J. <br/><br/>
CRYPTOGRAPHY: DIFFUSING THE CONFUSION 

 - ENGLAND  RSP  2001 
 - xv+152p., 23x15Cms. 
<br/><br/><label>ISBN: </label>0863802702 
<br/><br/><label>Dewey Class. No.: </label>519.7 P415