关键词: 基于位置服务, 隐私保护, 用户协作, 不确定性扩张

Abstract: In order to cope with the problem that the adversary can identify the real location of the user in continuous query service, in spite of the utilization of privacy protection method of distributed system architecture. This paper proposes a cell uncertainty extension method to provide location privacy protection for continuous query. This method utilizes the cache of collaborative users who located in the uncertainty continuous region to provide services for neighboring users, then reduces the direct interaction about information between the user and the service provider during the whole process of continuous query service. Furthermore, this method also leads the result of that the untrusted service provider cannot obtain enough information about the user to initiate the attack for users identification, and then provides a better privacy protection service for the user. At last, this paper utilizes the security analysis to verify the privacy protection level of the proposed method, and then utilizes the experimental verification to further verify the security of the proposed method as well as its execution efficiency.

Key words: location-based services, privacy protection, users collaboration, uncertainty extension