Turner, Sean <br/><br/>
Implementing email and security tokens:  current standards, tools, and practices / 
Sean Turner, Russ Housley 
 - Indianapolis, IN :  Wiley Pub.,  c2008 
 - xv, 296 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0470254637 9780470254639 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic mail systems--Security measures<br/>Computer security