Crytography and network security: principles and practices 
William Stallings 
 - \\  4th ed 
 -  Pearson Prentice Hall,Upper Saddle River,new Jersey  2006 
 - xvi,680p.: ill., 
<br/><br/> Bibliography : p. 663-672 
<br/><br/><label>ISBN: </label>131873164