Research On Privacy-Preserving Technology Of Smart Grid Based On Blockchain

As an important component of the next-generation power grid system,smart grid can achieve the balance of electricity supply and demand,contribute to communication security and privacy protection.Different from the characteristics of the centralized one-way communication of the traditional power grid,the smart grid combines information and control technology on the basis of the traditional power grid,and utilizes smart meters to perform two-way communication between the operation center and each gateway to realize real-time electricity consumption data collection and timely feedback of the system.Electricity companies can grasp the electricity consumption situation of every region through the collected electricity consumption data,and further analyze the electricity data and predict the electricity demand of users,so as to realize the dynamic adjustment of electricity supply during the peak period of electricity consumption.Although the popularization of smart grid brings great social benefits and technical advantages,there also exist several security and privacy issues.Characterized with decentralization and data tamper resistance,blockchain technology can solve the security and privacy problems in smart grid.However,the existing privacy-preserving schemes in smart grid based on blockchain still can not better solve the issues of multi-dimensional aggregation of electricity consumption data and the privacy protection of users.Based on the above problems,this thesis first clarifies the security requirements of electricity consumption data in smart grid,focuses on the distributed tamper resistance,efficient authentication and privacy protection of user’s electricity consumption data in smart grid based on blockchain,and proposes the security protection scheme for the above problems.In this thesis,the main research contents are comprised of the following two aspects.1.This thesis proposes a multi-dimensional data aggregation scheme for smart grid based on blockchain.In this scheme,after collecting electricity consumption data regularly,the smart meter leverages the anonymous authentication mechanism to hide the real identity information of electricity users.Then the electricity data is multi-dimensional aggregated and encrypted by using Paillier homomorphic encryption technology.After that,the aggregated and encrypted data is uploaded to the upper gateway for further data aggregation.After two times of data aggregation,the electricity consumption data is uploaded to the blockchain network for storage,which can be downloaded,decrypted and further used by the data management center node in the blockchain-based smart grid system.While protecting user’ s privacy,this scheme also supports batch authentication of messages,thereby improving the efficiency of message authentication.At last,the analyses of the correctness,security and performance of the scheme are described.2.This thesis proposes an auditable anonymous authentication scheme for smart grid based on blockchain.This scheme mainly researches on the application of ring signature in smart grid based on blockchain.The notion of auditable anonymous authentication is introduced in distributed setting.In this scheme,a blockchain auditing node is defined,which can distinguish the identity of the real signer from the signature ring,thereby realizing the identity auditing function during the process of anonymous authentication in smart grid.Last but not least,the analyses of the correctness,security and performance are made,and it is proven that the scheme has the properties of unforgeability,anonymity and traceability.