Abstract. While Location Based Services (LBS) can make our lives more cornfortable and productive, it may cause an invasion of privacy by disclosure and commercial use of location information. In this paper, we discuss privacy and security problems that may happen in the current LBS system and propose solutions. We propose a new secure Web services architecture for LBS in wireless network. Our architecture allows mobile users to create and enforce dynarnic policy for safe and consistent LBS. We also describe some practical seenarios in which our architecture protects user's location privacy and security.

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