Singh, Simon, <br/><br/>
The Code Book : 

 -  Fourth Estate (GB),  2000. 
 - 402 pages 
<br/><br/><label>ISBN: </label>9781857028898 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciphers.
<br/><br/><label>Dewey Class. No.: </label>652.8  / SIN