Computer security 

 - Virginia  Time-Life Books  1986 
 - 128p.  ill.  28cm 
 - Understanding computers .
 - Understanding computers .
<br/><br/> Includes index 
<br/><br/>Bibliography: p.122-124 
<br/><br/><label>ISBN: </label>0809456710 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computers--Access control
<br/><br/><label>Dewey Class. No.: </label>621.38195  / UND