关键词: 同态加密, 向量空间模型, 密文检索, 多关键词

Abstract: With the development of cloud storage service, more and more data owners trend to outsource private data to the cloud data storage provider. To ensure the data security, data on the cloud server should be stored in the encrypted form. The existing multiple keywords ciphertext retrieval techniques cannot balance the accuracy and security. This paper presents a scheme based on the improved vector space model and homomorphic encryption technology. The performance analysis shows that the scheme can effectively solve the retrieval problem on ciphertext.

Key words: homomorphic encryption, Vector Space Model（VSM）, ciphertext retrieval, multiple keywords