Bleumer, Gerrit. <br/><br/>
Electronic postage systems  technology, security, economics /  [electronic resource] : 
Gerrit Bleumer. 
 - Boston, MA :  Springer Science+Business Media, LLC,  2007. 
 - xxiii, 248 p. :  ill., digital ;  25 cm. 
 - Advances in information security ;  26 .
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9780387446066 (electronic bk.) 9780387293134 (paper) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Postal service--Technological innovations.<br/>Postal service--Data processing.<br/>Computer security.