Predicting Smartphone Users’ Permission Decisions

Current smartphone operating systems regulate application permissions by prompting users on an ask-on-first-use basis. Prior research has shown that this method is ineffective because it fails to account for context: the circumstances under which an application first requests access to data may be vastly different than the circumstances under which it subsequently requests access. LERSSE’s Primal is leading the research collaboration with UC Berkeley, in which a longitudinal 131-person field study was performed to analyze the contextuality behind user privacy decisions to regulate access to sensitive resources. We built a classifier to make privacy decisions on the user’s behalf, by detecting when context has changed and, when necessary, inferring privacy preferences based on the user’s past decisions and behavior. Our goal is to automatically grant appropriate resource requests without further user intervention, deny inappropriate requests, and only prompt the user when the system is uncertain of the user’s preferences. We show that our approach can accurately predict users’ privacy decisions 96.8% of the time, which is a four-fold reduction in error rate compared to current systems.

For more details, read the paper or come to its presentation on May 24:
P. Wijesekera, A. Baokar, L.Tsai, J. Reardon, S. Egelman, D. Wagner, K. Beznosov, “The Feasibility of Dynamically Granted Permissions: Aligning Mobile Privacy with User Preferences,” in IEEE Symposium on Security and Privacy (IEEE S&P), San-Jose, CA, May 2017, 17 pages.

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