Research On Smart Grid Data Security Aggregation Scheme Based On Blockchain

With the rapid development of information technology and the increasing complexity of power environment,traditional power grids are gradually unable to meet the needs of modern production and are replaced by the smart grid.While the smart grid provides convenience to people’s lives,it also brings many privacy and security issues.As the smart grid needs to collect electricity data of users to master the situation of the grid and adjust the time-of-use electricity price,the electricity data may be stolen by illegal attackers during the transmission process,resulting in the leakage of user privacy information.For example,an attacker can infer the user’s work and rest habits by collecting a large amount of electricity data of a user in various periods,which will expose the user’s personal privacy.In addition,with the large number of smart grid users and the huge amount of data,traditional data encryption transmission methods can no longer meet the performance requirements of data aggregation.Two secure and efficient solutions are proposed in response to the above issues in this paper.Aiming at the authenticity and integrity of aggregated ciphertext under outsourcing computing conditions,this paper proposes a scheme to achieve secure data security and incentive of smart grid based on Paillier algorithm.The scheme constructs multi-dimensional data through a super-increasing sequence,and adds information that can be aggregated and verified to ensure the integrity and authenticity of the aggregated data to multi-dimensional data.In addition,considering the rapid development of the photovoltaic power generation industry,this scheme introduces blockchain and ring signatures to achieve two-way anonymity between the grid management center and users during the photovoltaic power generation reward process,and adopts batch verification algorithms to reduce computing costs.Aiming at the untrustworthiness of third-party aggregators,this paper proposes a blockchainbased smart grid data aggregation scheme.This scheme divides the nodes of the blockchain into two parts: computing nodes and consensus nodes according to their functions.Each node is equipped with the software guard extensions introduced by Intel,which decouples the consensus layer and the computing layer while improving scalability and efficiency and enhancing the security of the blockchain at the smart contract layer and consensus layer.In addition,this scheme adopts smart contracts to realize data aggregation in the ciphertext state,ensuring the confidentiality and integrity of user power data during the data aggregation process.