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@Techreport{ Cheng, title = "Querying Private Data in Moving-Objet Environments", author = "Reynold Cheng, Yu Zhang, Elisa Bertino, Sunil Prabhakar", abstract = "Location-based services, such as finding the nearest gas station, require users to supply their location information. However, a user", affiliation = "The Hong Kong Polytechnic University, Purdue University", subject = "Privacy of Location-based services", }