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With the abundance of location-aware portable devices such as cellphones and PDAs, a new emerging application is to use this pervasive computing platform to learn about the whereabouts of one's friends and relatives. However, issues of trust, security and privacy have hindered the popularity and safety of the systems developed for this purpose. We identify and address the key challenges of enabling private spatial queries in social networks using an untrusted server model without compromisingdoi:10.1109/cse.2009.337 dblp:conf/cse/KhoshgozaranS09 fatcat:o36wr2mhjfhufnyultxi75tcvu