Shepherd, J Simon <br/><br/>
Cryptography : diffusing the confusion 

 - Baldock  RSP  2001 
 - xiv,152p.  HB  20cm. 
<br/><br/> include index 
<br/><br/><label>ISBN: </label>9780863802706 
<br/><br/><label>Dewey Class. No.: </label>005.82  / SHE