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Touchalytics: On the Applicability of Touchscreen Input as a Behavioral Biometric for Continuous Authentication

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5 Author(s)
Frank, M. ; Univ. of California Berkeley, Berkeley, CA, USA ; Biedert, R. ; Ma, E. ; Martinovic, I.
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We investigate whether a classifier can continuously authenticate users based on the way they interact with the touchscreen of a smart phone. We propose a set of 30 behavioral touch features that can be extracted from raw touchscreen logs and demonstrate that different users populate distinct subspaces of this feature space. In a systematic experiment designed to test how this behavioral pattern exhibits consistency over time, we collected touch data from users interacting with a smart phone using basic navigation maneuvers, i.e., up-down and left-right scrolling. We propose a classification framework that learns the touch behavior of a user during an enrollment phase and is able to accept or reject the current user by monitoring interaction with the touch screen. The classifier achieves a median equal error rate of 0% for intrasession authentication, 2%-3% for intersession authentication, and below 4% when the authentication test was carried out one week after the enrollment phase. While our experimental findings disqualify this method as a standalone authentication mechanism for long-term authentication, it could be implemented as a means to extend screen-lock time or as a part of a multimodal biometric authentication system.

Published in:

Information Forensics and Security, IEEE Transactions on  (Volume:8 ,  Issue: 1 )
Biometrics Compendium, IEEE