| The limitation to the traditional grid leads to poor management and abuse of power. With the development of computer technology and communication technology and the infiltration of traditional electric power industry, different countries and electricity companies puts forward the concept of the new grid: smart grid. The aim of Smart grid is to be able to provide users with high reliability, high safety, high efficiency and the environmental protection electric energy, improve the country’s energy structure, promote the sustainable development of energy. The essential characteristics that Smart grid different from traditional grid is power flow and communication flow of biphasic. It is often assumed that the first step to realize a smart grid is to deploy advanced metering infrastructure(AMI), and smart meters and smart terminal occupies the core position in advanced metering infrastructure.The generation of new technology is often accompanied by new problems, along with the deployment of smart devices, network boundary closer to the user side, the user side information security will become even more prominent. Particularly, user privacy information disclosure problem is the most important. Through the analysis of electricity data of the user, Attacker can get the user habits and basic information, family and even serious information can be obtained with the user account, once the information is used. It will produce a great harm.In this paper, we are absorbed in privacy preserving. Based on user privacy problem study, we proposed a new privacy preserving scheme, And designed a cipher coprocessor. It can be better applied to privacy protection, the scheme of simulation in the cipher coprocessor at last. The following research results were obtained:(1) We first introduced the concept of smart grid and analyzed of user privacy. Then, we summarized the existing solutions. Through analyzed the smart meter existence attack types, we put forward the smart meters user privacy security requirements. This requirements contain : anonymity, non-repudiation, forward Security, traceability and unlinkability. At the same time, we analyzed the existing smart meters privacy the parties and their respective responsibilities defined in the model.(2) We analyzed the former group signature scheme and points out that the solution exists in the application in the smart meters privacy protection after signature is open, changes in the early period of the signer sign will lose its anonymity. Therefore we propose a new user privacy protection scheme based on a group signature. The new scheme improves the anonymity and forward security. It also has a very high efficiency, because the scheme based on Elliptic Curve Discrete Logarithmic Problems.(3) Hardware realization of cipher algorithm has incomparable advantage with software to realize. In this paper, a General cipher coprocessor is designed based on FPGA. The cipher coprocessor has realized the sm3, sm4 and elliptic curve point multiplication algorithm using reconfigurable technology. Through the microprocessor sends a control signal to the configuration of CPLD chip to control the dynamic loading of the flow of the FPGA configuration file. After verify, the chip achieve the preset functions.(4) At last, we simulated the privacy protection scheme based on the cipher coprocessor which were designed in fourth part. The Cipher coprocessor communicate with PC through serial port. The simulation got to the aim results. |
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