Abhilasha Bhargav-Spantzel Anna Cinzia Squicciarini Shimon K. Modi Matthew Young Elisa Bertino Stephen J. Elliott Privacy preserving multi-factor authentication with biometrics. 529-560 2007 15 Journal of Computer Security 5 http://iospress.metapress.com/content/3626171362x61240/ db/journals/jcs/jcs15.html#Bhargav-SpantzelSMYBE07