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The last few years have witnessed an increasing availability of location-based services (LBSs). Although particularly useful, such services raise serious privacy concerns. For example, exposing to a (potentially untrusted) LBS the client's position may reveal personal information, such as social habits, health condition, shopping preferences, lifestyle choices, etc. There is a large body of work on protecting the location privacy of the clients. In this paper, we focus on shortest path queries,doi:10.1109/icdew.2013.6547441 dblp:conf/icde/Mouratidis13 fatcat:thzmzpguonco5c5kjojmzmh7jy