ACP: An Efficient User Location Privacy Preserving Protocol for Opportunistic Mobile Social Networks

摘要

Users face location-privacy risks when accessing Location-Based Services (LBSs) in an Opportunistic Mobile Social Networks (OMSNs). In order to protect the original requester's identity and location, we propose a location privacy obfuscation protocols, called Appointment Card Protocol (ACP), utilizing social ties between users. To facilitate the obfuscation operations of queries, we introduce the concept called Appointment Card (AC). The original requesters can send their queries to the LBS directly using the information in the AC, ensuring that the original requester is not detected by the LBS. Also, a path for reply message is kept when the query is sent, to help reduce the time for replying queries. Simulation results show that our protocol preserves location privacy and has a higher query success ratio than its counterparts.