Bosworth, Bruce <br/><br/>
Codes, ciphers, and computers :  an introduction to information security / 
Bruce Bosworth 
 - Hasbrouck Heights, N.J. :  Hayden Book,  1982 
 - 259 p. :  ill. ;  23 cm 
<br/><br/>Includes bibliographies and index 
<br/><br/><label>ISBN: </label>0810451492  pbk 
<br/><br/><label>LCCN: </label>82-3068 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography<br/>Computers--Access control--Passwords<br/>Data protection