Adams, Simon     <br/><br/>
Code breakers   from hieroglyphs to hackers 
by Simon Adams ; consultant Peter Crisp. 
 - New York, NY :  DK Publishing,  c2002. 
 - 96 p. :  ill. (some col.) ;  20 cm. 
 - Secret worlds . <br/><br/> "A Dorling Kindersley book."  "Includes top websites"--Cover. 
<br/><br/> The world of codes...how to break codes.  
<br/><br/> 9 - 12 years 
<br/><br/><label>ISBN: </label>078948529X  0789485303 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciphers<br/>Cryptography
<br/><br/><label>Dewey Class. No.: </label>j652.8 Ada   26