Research Of Complete Privacy Protection In Smart Metering Based On Ring Signing

The rapid rise of energy internet has been affecting and changing the development direction of smart grid system framework.The system exploits numerous access terminal to acquire users' power expenditure information in real time,and transmit it to power company to function well in balancing loads and real-time pricing through advanced telecommunication networks.The large-scale data acquisition and complexed access environment inevitably involves in eavesdropping and manipulating of users' sensitive information.So it has become a hot research issue to guarantee secure transmission of user information and power expenditure data when acquiring user consumption efficiently and the traditional digital encryption algorithm cannot meet the needs of user privacy security.Under this background,this thesis introduces ring signature technique,which owns unique unconditional anonymity and great encryption effect,to smart grid,simultaneously guaranteeing data security and protecting user information,to achieve the goal of privacy protection.First,this thesis analyzed the problem of privacy security faced by smart grid and studied the way of resolving the problem,and choose a more practical algorithm based on the particularity of smart grid application.Next,Security analysis indicated that Qin's scheme could not resist All attack,and given a detailed attack method.For this kind of attack,this thesis proposed a new certificateless ring signcryption scheme without bilinear pairing,which was based on elliptic curve discrete logarithm problem.This new algorithm could meet the need of security and take less charge for calculation.Then,In order to better adapt to the application environment of smart grid and meet the real-time requirement of power grid,aggregate signcryption technology is introduced,this thesis designed a less expensive aggregate signcryption algorithm,and through theoretical analysis and experiments show that the new algorithm is based on satisfying security requirements,and has less computation cost,which lightens the workload of smart grid control center and makes it better in decision-making control.Finally,this thesis gave a complete privacy-protection plan by integrating ring signature and aggregate signcryption algorithm.And to guarantee users' privacy security and basic function of power grid,power measurement function for example,An improved ring signature algorithm is introduced,enabling the whole set of plan cost less in algorithm and function well in privacy protection.Also the plan is feasible in field of power grid protection for it is closer to the reality of power grid.