Research On Based-location Service Privacy Protection In Wireless Sensor Networks

The progress of sensor technology, wireless communication technology and embeddedtechnology, have being promoting the wireless sensor networks development. Compared totraditional networks, wireless communication technology has many advantages, such as low powerconsumption, good scalability, multi-function. Wireless sensor networks can be used in a very widerange of applications, including a new branch, based location service. Location-based service makesit to possibility which people can check any information at any time in any where using any type ofequipment. However, in the process of query information is likely to be exposed its own locationinformation, resulting in personal privacy, so one of the looming challenges that threaten thepersonal security is location privacy in wireless sensor networks. In this thesis, two differentapproaches are proposed to enhance the based-location privacy in WSN. The main research worksand contributions of this thesis are summarized as follows:1. The architecture and main features of wireless sensor networks are discussed, and thesecurity issues and applications are introduced. Then the system model of based-location serviceand the security threats when people check information are presented. In addition, the exitingschemes and protocols which can provide WSN location privacy are summarized.2. The technology, architecture, main features and security of based-location service aresummarized. Then discussing the protected protocols of based-location service, and analyzing thefactors which impact of the contradiction between privacy requirements and query service of quality,then establishing a model of the evaluation criteria for assessment of location privacy protection.3. Several privacy protection protocols, including the Interval Cloak, Casper Cloak, HilbertCloak, Clique Cloak, Privacy Grid, mix-zone, are summarized. These protocols can effectivelyprotected people’s privacy when query any information.4. In order to tradeoff the balance of privacy requirements and the quality of query service, anew protocol called circular zoning is proposed. The protocol can ensure that when people require ahigh privacy requirement can form a suitable cloaking region, at the same time ensure the quality ofservice is the most optimization. Considering the user’s circumvents and the distribution density,introduce an anonymous parameter, user can choose an appropriate, according to theenvironments. That can more effectively balance contradictory relationship between the privacyrequirements and the quality of service. The simulation results show that the circular zoning caneffectively protect user’s privacy without increasing cloaking region, and reduce the time ofanonymous; also the success ration of anonymous is very high. 4. Based on information entropy, proposed a new privacy protocol called location-aware.When user in a sparse environment, in order to meet k-anonymous should expand a very largecloaking region, which results heavy communication and compute burden on location server sideand the anonymous server side. So using the sampling theorem to filled the areas with user’sfootprints and initialized the anonymous database. Consider the problem of the quantification ofprivacy protection requirements, proposed the notion of security entropy, which could effectivelyspecify a privacy requirement instead of a number. Simulation results show that location-aware canbetter measure the performance of location privacy protection; with high privacy requirement theexpanding of cloaking region is not obvious, and the success ration of anonymous could reach100%.