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Enabling Trajectory Constraints for Usage Control Policies With Backtracking Particle Filters

Authors:
Philipp Marcus
Moritz Kessel
Claudia Linnhoff-Popien

Keywords: Mobile Usage Control; Indoor Positioning; Backtracking Particle Filter; Location-based Access Control

Abstract:
A number of studies extended access control policies with constraints, aiming at the restriction of mobile users' access to appropriate authorized areas. Recent research proposed to rely on usage control instead, in order to allow for continuous checks of the user's location. A drawback of those approaches is that they rely on crisp trajectory estimates, i.e., spatio-temporal paths, not considering occurring uncertainty. This makes those approaches impractical for indoor applications, where occurring measurement errors are typically large compared to authorized areas. Thus, in this study, we propose extensions for usage control policies to constrain users to an authorized area for the duration of access. We adhere probabilistic trajectories derived from backtracking particle filters combined with WiFi fingerprinting. However, the main contribution is a risk-based model for deriving usage decisions based on risk factors instead of conventional thresholds. Our results show, that particle filters are crucial due to inaccuracy in WiFi positioning. We achieve a true- and false-positive rate of 80% and 6.7%. Finally, this allows to effectively constrain access to appropriate areas in indoor scenarios.

Pages: 52 to 58

Copyright: Copyright (c) IARIA, 2013

Publication date: November 17, 2013

Published in: conference

ISSN: 2308-3468

ISBN: 978-1-61208-313-1

Location: Lisbon, Portugal

Dates: from November 17, 2013 to November 21, 2013