A Distributed Privacy-Preserving Scheme for Location-Based Queries
In this paper, the authors deal with security and historical privacy in Location Based Service (LBS) applications where users submit accurate location samples to an LBS provider. Specifically, they propose a distributed scheme that establishes access control while protecting the privacy of a user in both sporadic and continuous LBS queries. Their solution employs a hybrid network architecture where LBS users: are able to communicate with an LBS provider through a network (e.g., cellular) operator, and they are also able to create wireless ad-hoc networks with other peers in order to obtain privacy against an adversary that performs traffic analysis. Their threat model considers the network operator, the LBS provider and other peers, as potential privacy adversaries.