Piper, F. C.  1940- <br/><br/>
Cryptography :  a very short introduction / 
Fred Piper and Sean Murphy 
 - Oxford :  Oxford University Press,  2002 
 - 142 p. :  ill. ;  18 cm. 
 - Very short introductions .
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0192803158  RM29.90 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography