Research And Implementation Of Privacypreserving Multidimensional Aggregation Scheme For Smart Grid

With the development of technology and the arrival of the information age, social economy has made rapid development, this enhance the people's standard of living. At the same time, each household electricity consumption increase year by year. The traditional power system can't meet people's increasing electricity demand any more, the smart grid arises at the historic moment. The smart grid, which is highly integrated traditional power system with modern information technology, communication technology, and computer technology. It can provide electricity supplier with more convenient operation and efficient management. Besides, smart grid can fully meet the user's demand and achieve the optimal allocation of power resources. However, smart grid is at a early stage, it still faced with many challenges in terms of data security and privacy protection. Although some existing data aggregation scheme can solve the problem of privacy protection to some extent, they have disadvantages of poor security flaws about data forwarding and providing limted information to power supplier. In this paper, based on the smart grid's privacy problem, by using group signature and Paillier encryption homomorphic technology, it can protect the privacy of the user identity privacy and data while providing service operator with more efficient user information, the main work as follows:First, through group signature and Pailiier encryption homomorphic technology, without disclosing the privacy-sensitive information(i.e., identify and power consumption) of users, the operation center can obtain more efficient user information, including total electricity consumption, ladder electricity and the number of users. Through these efficient information, operation center can develop a reasonable ladder electricity price, effectively adjust the power resources, and make the area power consumption achieve load balancing, finally energy and greenhouse reductions can be achieved.Second, it achieves privacy-perserving about user identity and user data. After legal area user's real-time power consumption information on smart meters encryped and being signature, these valid information will transport to resident center. And then regional center confirms the identity of the user by using group signature, it directly sents the results of data aggregation to operation center rather than decrypt the aggregated data. In the whole process of data transmission, user information about user's identity and data will not be leaked, the scheme protect the privacy of user's indetity and electricty consumption.Third, it can achieve the traceable anonymity of user identity. We employ a specific group signature scheme in the process of user authentication, which can obtain the authentication and traceability of message. The regional center checks out the message and signature without knowing the user's identity. But if the user's signature is proved to be invalid, the identity of malicious smart grid could be ferreted out with the help of TA.