关键词: CKKS, CPABE, 同态加密, 隐私保护, 数据共享

Abstract: The State Grid has a large amount of electricity data, and researches on the data is an important task. This often involves massive data computation and transmission, so how can the research institutions safely and efficiently apply for and obtain State Grid data is an urgent issue to be solved. At the same time, State Grid is willing to share data under the premise of ensuring data security. Given this problem, this paper designs a State Grid datasharing scheme based on CKKS(CheonKimKimSong) and CPABE(CiphertextPolicy AttributeBased Encryption). To achieve data transmission security and ciphertext calculation, we use the CKKS scheme to encrypt the data. Bring in thirdparty service providers for efficient processing of data. It also enables data access control and onetomany data transmission and sharing through CPABE algorithm to improve sharing efficiency. Then, this paper gives the  proof of the security of the scheme, and through experimental methods, the sharing efficiency of this scheme is tested and compared with existing systems. The experimental results show that this scheme can process data more efficiently while ensuring data security, and maintaining a low computation error.

Key words: CKKS, CPABE, homomorphic encryption, privacy protection, data sharing