Research On Privacy Preserving Data Aggregation In Smart Grid

Smart grid is based on the traditional power grid,through the introduction of information technology to realize the two-way interaction of data between various entities,to solve the problems of low energy utilization,poor control,weak security and so on.In the smart grid,due to the large amount of data transmission and the short period,the system transmission bandwidth is increased and the delay is increased.At the same time,the data transmission will cause the leakage of data and user privacy information.Privacy protection data aggregation technology can compress massive data,reduce network transmission bandwidth and delay,while protecting data security and user identity privacy.Therefore,studying the aggregation of privacy protection data in the smart grid has important theoretical value and practical significance,and has become a hot issue in the field of cryptography research.The thesis researches on the design of privacy protection data aggregation scheme and security certification in the smart grid scenario,including:(1)Aiming at the problem of multi-dimensional data aggregation efficiency,based on the elliptic curve cryptosystem,this paper proposes an efficient privacy protection multidimensional data aggregation scheme in the smart grid.The proposed scheme utilizes El Gamal encryption and super-growth sequence technology to realize classified encryption and aggregation of electricity data to protect user data security and identity privacy protection.The security analysis shows that under the assumption of secure El Gamal encryption and elliptic curve discrete logarithm in the random oracle model,it is proved that the proposed scheme meets confidentiality and unforgeability.At the same time,the scheme meets integrity,privacy,authentication and can resist various common attacks.Compared with known schemes,the proposed scheme achieves lower computational cost and communication cost,and is more suitable for smart grid applications.(2)In view of the error tolerance and dynamic billing problems of data aggregation in the smart grid,this paper proposes a data aggregation scheme that supports error tolerance and dynamic bill privacy protection in the smart grid.The proposed scheme uses Paillier encryption and Shamir secret sharing technology to achieve data privacy protection and error tolerance in data aggregation.Through dynamic billing,users dynamically adjust and plan their electricity consumption strategies based on electricity prices.Security analysis shows that based on secure Paillier encryption and pseudo-random sequence security in the random oracle model,it proves that the proposed scheme meets confidentiality and unforgeability.At the same time,the scheme satisfies the integrity,privacy,authentication and can resist common attacks.Compared with the known schemes,the proposed scheme increases the computational cost and communication cost by a small amount to realize the function of error tolerance and dynamic billing.