15th USENIX Security Symposium Abstract
Pp. 2941 of the Proceedings
Biometric Authentication Revisited:
Understanding the Impact of Wolves in Sheep's Clothing
Lucas Ballard and Fabian Monrose, Johns Hopkins University; Daniel Lopresti, Lehigh University
Biometric security is a topic of rapidly growing importance, especially as it applies to user authentication and key generation. In this paper, we describe our initial steps towards developing evaluation methodologies for behavioral biometrics that take into account threat models which have largely been ignored. We argue that the pervasive assumption that forgers are minimally motivated (or, even worse, naïve), or that attacks can only be mounted through manual effort, is too optimistic and even dangerous. To illustrate our point, we analyze a handwriting-based key-generation system and show that the standard approach of evaluation significantly overestimates its security. Additionally, to overcome current labor-intensive hurdles in performing more accurate assessments of system security, we present a generative attack model based on concatenative synthesis that can provide a rapid indication of the security afforded by the system. We show that our generative attacks match or exceed the effectiveness of forgeries rendered by the skilled humans we have encountered.
- View the full text of this paper in HTML and PDF. Listen to the presentation and Q & A in MP3 format.
Until August 2007, you will need your USENIX membership identification in order to access the full papers.
The Proceedings are published as a collective work, © 2006 by the USENIX Association. All Rights Reserved. Rights to individual papers remain with the author or the author's employer. Permission is granted for the noncommercial reproduction of the complete work for educational or research purposes. USENIX acknowledges all trademarks within this paper.