关键词: 同态加密, 电力数据加密, 云存储, 密文检索, 二分查找

Abstract: With the development trend of power data connectivity and sharing, the overall business demand for power data privacy computing is constantly improving.  Homomorphic encryption, as a mainstream privacy computing technology today, still suffers from low retrieval efficiency and complex multikeyword data processing when applied to ciphertext retrieval algorithms. Therefore,this paper designs a cloud storage scheme for ciphertext power data based on Paillier homomorphic encryption algorithm, combined with AES and RSA signature algorithms to satisfy INDCPA security, and optimizes the multiciphertext keyword retrieval algorithm by using the idea of sorting and dichotomous lookup, and proves the correctness and tests the operation efficiency of the scheme by means of experiments. Experimental results show that the algorithm can retrieve target ciphertext data and complete multikeyword data operation under O(log N) time complexity. Compared with previous ciphertext retrieval schemes, it has the characteristics of lightweight cipher operation and efficient ciphertext retrieval and has better practical value.

Key words: homomorphic encryption, power data encryption, cloud storage, ciphertext retrieval, binary search