Research On Improved Location Privacy Protection Method Based On Spacetwist

The vigorous development of mobile Internet technology makes smart phones and other mobile terminals play an irreplaceable role in people's lives.Which derived from the combination with the positioning technology and geographic information systems call location-based services has brought great convenience for people's travel.But the service provider only to obtain user location information to provide services,and just because the user demand for this service increases,followed by the security issues are gradually increasing.The trade-off between location-based query quality and location privacy protection in mobile Internet is one of the current research hotspots.So it is of great research and practical significance to study how to improve the disclosure of privacy in the case of guaranteeing the quality of service.In this paper,the architecture of the location privacy protection system and the existing location privacy protection methods are studied.The advantages and disadvantages of the three system architectures and technical methods are analyzed.This paper proposes a kanonymous incremental query location privacy protection method based on the SpaceTwist scheme.This method uses the client-server architecture,and forms the k-anonymous area around the client's location to ensure that the user real location near the k-1 users to confuse the attacker and ensure the user's location privacy.Take the centroid of the supply anonymous region as anchor and use the anonymous transformation method to make the real location excluded from the anonymous area,while ensuring the location of privacy at the same time choosing a more appropriate range to take the anchor points compared with the way of random selection of anchor improving the quality of location query services.And at last in the form of incremental queries to initiate a request to return the query result set.The model avoids the use of third-party servers to make it an attack point,which improving the accuracy of the query while ensuring the user's location privacy effect.Finally,the simulation experiment of the improved method under the position privacyprotection model is carried out,and it is compared with the classical scheme in query precision,anonymous success rate,response time and other factors.The results show the effectiveness of the proposed method.