Abstract

Recently, highly accurate positioning devices enable us to provide various types of location based services (LBS). Since location information may reveal private information, preserving location privacy has become a significant issue in LBS. Lots of different techniques for securing the location privacy have been proposed, for instance the concept of Silent period, the concept of Dummy node, and the concept of Cloaking-region. However, many of these were not focused on information leakage on the servers. In this paper, we propose a user location management method based on the secure computation algorithm which protects information leakage from the location management servers. This algorithm is based on the multi-party computation and the computation complexity is not so high. We evaluated the proposed scheme in comparison with the method based on the homomorphic cryptographic method.

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