One-round secure fair meeting location determination based on homomorphic encryption

Determination of optimal meeting location without revealing the locations of participants to the location server is an interesting research problem. A major concern for a location based service is location privacy. However, adding privacy protection to a location service will inevitably introduce computational complexity. To provide location privacy with low computational cost is a challenging task. In this paper, we propose a one-round meeting location determination protocol, where the location service provider makes a decision with a semi-trusted cloud server which works as a computation center and conducts most of computation. The user location privacy is preserved against the outside and internal attackers including the computation center, the meeting location determination server and participants. In order to study the performance of the protocol, we test its computational efficiency on smartphones. The simulation results and the performance comparison of our protocol with another protocol of the same functionalities demonstrate that our solution is more efficient and practical.