Published Paper Details:

The major aim of Location Based Services (LSB) is based on the location, it is used to provide services like food ordering system, Google map and some kind of e-shopping websites are completely based on locations. Based on the user location LSB provide continuous report to the un trusted server to obtain the services which can avoid privacy risks.LBS have existing privacy-preserving techniques as requiring a fully-trusted third party, it offers limited privacy guarantees and incurring high communication overhead. In this paper, we propose a user-defined privacy grid system which is called as dynamic grid system (DGS). Privacy-preserving snapshot and continuous LBS have four effective requirements. . (1) A semi-trusted third party is responsible for matching operations correctly and it does not have any information about a user's location. (2) Secure snapshot and continuous location privacy is guaranteed to defined adversary models. (3) The communication cost for the user does not depend on the user's desired privacy level; it depends on the number of relevant points of interest in the domain of the user. (4) The system can be easily enlarged to support other spatial queries without changing the algorithms run by the semi-trusted third party and the database server. Experimental results show that the DGS is more efficient than the state-of-the-art privacy-preserving technique for continuous LBS.