Stallings,William, <br/><br/>
Cryptography and network security :   Principles and practice / 
by William Stallings .  
 - 7th ed. 
 - Uttar Pradesh:  Pearson Education Limited,  2017. 
 - 766p. 
<br/><br/><label>ISBN: </label>9789332585225 
<br/><br/><label>Dewey Class. No.: </label>BV  / Q7