The PROBE Framework for the Personalized Cloaking of Private Locations
Transactions on Data Privacy
Anonymization of moving objects databases by clustering and perturbation
Information Systems
Design and analysis of a ranking approach to private location-based services
ACM Transactions on Database Systems (TODS)
Query-aware location anonymization for road networks
Geoinformatica
Trajectory privacy in location-based services and data publication
ACM SIGKDD Explorations Newsletter
Shortest path computation with no information leakage
Proceedings of the VLDB Endowment
Hilbert-order based spatial cloaking algorithm in road network
Concurrency and Computation: Practice & Experience
Mobile Information Systems
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The increasing availability of location-aware mobile devices has given rise to a flurry of location-based services (LBSs). Due to the nature of spatial queries, an LBS needs the user position in order to process her requests. On the other hand, revealing exact user locations to a (potentially untrusted) LBS may pinpoint their identities and breach their privacy. To address this issue, spatial anonymity techniques obfuscate user locations, forwarding to the LBS a sufficiently large region instead. Existing methods explicitly target processing in the euclidean space and do not apply when proximity to the users is defined according to network distance (e.g., driving time through the roads of a city). In this paper, we propose a framework for anonymous query processing in road networks. We design location obfuscation techniques that: 1) provide anonymous LBS access to the users and 2) allow efficient query processing at the LBS side. Our techniques exploit existing network database infrastructure, requiring no specialized storage schemes or functionalities. We experimentally compare alternative designs in real road networks and demonstrate the effectiveness of our techniques.