Stallings, William. <br/><br/>
Cryptography and network security  Principles and practice 
by William Stallings 
 - 2nd ed. 
 - Upper Saddle River, New Jersey  P-H  1999 
 - xvii, 569p. 
<br/><br/><label>ISBN: </label>0139738193 
<br/><br/><label>Dewey Class. No.: </label>005.82  / N99