PINCOCK Stephen <br/><br/>
Codebreaker :  the history of codes and ciphers, from the ancient pharaohs to quantum cryptography 
Stephen Pincock 
 -  Walker publishing company /  2006 
 - 176 p  ill. 
<br/><br/><label>ISBN: </label>9780802715470 (pbk) :  36.95 SGD