| With the development of the power industry,the introduction of smart grid technology has enabled the automation,informatization and intelligence of the power grid to be realized,which has improved the energy utilization efficiency and the sustainable development level of energy.However,with the development of smart grid,the connection of equipment in each link is becoming more and more close and complex,and the security issue of smart grid has attracted more and more attention.The security issues of the smart grid involve multiple fields such as information technology,communication technology,and power system technology,so it is necessary to comprehensively use various technical means to prevent and manage them.Aiming at the data security problem of smart grid,this paper deeply studies the privacypreserving mechanism of smart grid data,and proposes a smart grid data security aggregation scheme and a smart grid data access control scheme under the environment of malicious users.Specifically,the main contributions of this paper are as follows:· Research on Data Security of Smart Grid under Malicious User Environment.The secure data aggregation of smart grid in the environment of malicious users is studied,and a new smart grid model based on cloud-fog computing is proposed.Based on this model,an efficient and privacy-preserving smart grid scheme is constructed.This scheme uses the method of secret sharing to achieve aggregated communication,and without sacrificing privacy,it supports cloud nodes and fog nodes to detect false data attacks initiated by malicious users to ensure that the electricity usage data is within a reasonable range.In addition,security analysis shows that this scheme meets privacy,anonymity,and robustness.Finally,the property comparison and experimental results show that,compared with similar schemes,this scheme has better properties and better computing and communication overhead.· Research on Data Access Control of Smart Grid Based on Decentralized Attribute-based Encryption Scheme.Smart grid data access control in the environment of malicious users is studied,and a specific scheme is proposed.This scheme supports cloud nodes or fog nodes to set some specific access attributes for aggregation reports of electricity usage data.Service providers can only obtain aggregation reports on cloud nodes or fog nodes if these attributes are met.In addition,security analysis shows that this scheme can guarantee privacy-preserving against any probabilistic polynomial time adversary.Finally,the efficiency analysis shows that the encryption of aggregated reports by cloud nodes,the decryption of aggregated reports by service providers,and the aggregation of electricity consumption data by cloud nodes all have good computational overhead.The work of this paper provides theoretical support and technical support for smart grid data security and access control in the environment of malicious users. |
