Fault-tolerant data aggregation scheme supporting fine-grained linear operation in smart grid

Smart grid is a combination of traditional power system engineering and information communication technology. provides users with convenient services through real-time data updates. Multi-dimensional aggregation can be more flexible for statistical analysis electricity information. However, most the existing multi-dimensional schemes require participation trusted third party do not support fault tolerance. In this paper, we propose fault-tolerant scheme supporting fine-grained linear operations in smart grid. Firstly, used Chinese remainder theorem to encode user’s corresponding weights. Secondly, construct privacy-preserving without party, by combining paillier homomorphic encryption secure key agreement protocol. Finally, use extended Shamir secret sharing that supports reuse shared shares. Security results show our satisfies semantic security user privacy protection. Experimental compared multidimensional does increase additional computation overhead.