Kippenhahn, Rudolf, <br/><br/>
Code breaking :  a history and exploration / 
Rudolf Kippenhahn ; translated from the German, in collaboration with the author, by Ewald Osers. 
 - Hyderabad :  Universities press,  1999. 
 - 283 p. :  ill. ; 
<br/><br/><label>ISBN: </label>0879519193 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography.<br/>Cryptography--History.
<br/><br/><label>Universal Decimal Class. No.: </label>681.188(091)  / KIP