Research On Path Privacy Protection In Location Service

With the development of Computer network space and mobile wireless global positioning technology Service(Location-Based Service,LBS),a mobile application service has been paid more and more attention and applied to every aspect of life.In the use of location-based services,the user first places its own Information and query messages are sent to the location service provider.The media of information transmission are various and complex.In this process,the location of the user's privacy and inquiries are likely to be intercepted by criminals,and even attacks,causing security risks to users.Therefore,for the location The research of privacy protection technology has become a research topic.In this paper,based on the summary of the existing privacy protection methods,and based on the system structure of location privacy protection,the following aspects are discussed and studied:First of all,this paper introduces the issues related to the location service and the privacy protection in location-based services.Secondly,this paper proposes a trajectory based privacy preserving method and a trajectory privacy protection method based on the suppression method.According to the requirements of the user's privacy protection,the pseudo trajectory method inputs the relevant parameters,and the server generates a number of false trajectories which are similar to the true trajectory.The server generates several false trajectories with high similarity to the real trajectory to confuse the attacker,which makes it difficult for the attacker to distinguish the true and false trajectories.Thirdly,in order to avoid the sensitive location of the user,a privacy preserving model based on inhibition method is proposed.Suppress the user's sensitive location information,The probability matrix of the user's travel is established.From the point of view of probability,a non sensitive position of the maximum probability of arrival is replaced with a sensitive position.So as to avoid the sensitive position of the release,to protect the user's sensitive information leakage.And effectively protect the user's trajectory and protect the privacy of the user.This method can effectively prevent the attacker from the sensitive location to launch attacks.Finally,the validity of the method is verified by comparing the simulation results with the random method.