Wobst, Reinhard & Shafir, Anglika <br/><br/>
Cryptology unlocked 

 - John  wiley & sons, England  2001 
 - xiii,540 
<br/><br/><label>ISBN: </label>9780470060643 
<br/><br/><label>Dewey Class. No.: </label>001.5436 Wob