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1. TOWARD PRIVACY PRESERVING AND COLLUSION RESISTANCE
IN A LOCATION PROOF UPDATING SYSTEM
ABSTRACT:
Today's location-sensitive service relies on user's mobile device to determine the current
location. This allows malicious users to access a restricted resource or provide bogus alibis by
cheating on their locations. To address this issue, we propose A Privacy-Preserving LocAtion
proof Updating System (APPLAUS) in which colocated Bluetooth enabled mobile devices
mutually generate location proofs and send updates to a location proof server. Periodically
changed pseudonyms are used by the mobile devices to protect source location privacy from
each other, and from the untrusted location proof server.
We develop user-centric location privacy model in which individual users evaluate their location
privacy levels and decide whether and when to accept the location proof requests. In order to
defend against colluding attacks, we also present betweenness ranking-based and correlation
clustering-based approaches for outlier detection. APPLAUS can be implemented with existing
network infrastructure, and can be easily deployed in Bluetooth enabled mobile devices with
little computation or power cost. Extensive experimental results show that APPLAUS can
effectively provide location proofs, significantly preserve the source location privacy, and
effectively detect colluding attacks.
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