The code book :   the evolution of secrecy from Mary, Queen of Scots, to quantum cryptography 
Singh, Simon 
 - London :  Fourth Estate,   1999. 
 - 402 p.: 
<br/><br/><label>ISBN: </label>9781857028898 
<br/><br/><label>Subjects--Topical Terms: </label>--School of Pure and Applied Sciences
<br/><br/><label>LC Class. No.: </label>Z 103   / .S56 1999 
<br/><br/><label>Dewey Class. No.: </label>Z 103 .S56 1999