Stallings, William <br/><br/>
Cryptography and network security : principles and practices. 

 - 4th. ed. 
 - New Delhi  Pearson Education  2006. 
 - xvi; 680 p. 
<br/><br/><label>ISBN: </label>8177587749 (paperback) 9788177587746 (paperback) 
<br/><br/><label>Source: </label> 390.00 PKR