Singh, Simon. <br/><br/>
The Code Book :  The Evolution of Secrecy from Mary, Queen of Scots, to quantum cryptography / 
Simon Singh. 
 - 1st ed. 
 - New York :  Doubleday,  c1999. 
 - xiii, 402 p. :  ill., map ;  25 cm. 
<br/><br/>Includes bibliographical references (p. 388-393) and index. 
<br/><br/><label>ISBN: </label>9781857028799 1857028791 
<br/><br/><label>LCCN: </label>99035261  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography--History.<br/>Data encryption (Computer science)--History.
<br/><br/><label>LC Class. No.: </label>Z103  / .S56 1999 
<br/><br/><label>Dewey Class. No.: </label>652.809  / SIN