Churchhouse, R. F.. , <br/><br/>
Codes and ciphers :  julius caesar, enigma and the internet / 
R. F. Churchhouse. 
<br/><br/><label>ISBN: </label>052181054X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography.<br/>Ciphers.
<br/><br/><label>LC Class. No.: </label>Z103   / .C48 2002