关键词: 云存储, 同态性, 向量空间模型, 整数向量加密, 多关键词

Abstract:

In order to effectively protect the security of outsourced data, it satisfies the problem of users efficiently searching data stored in the cloud. A cloud storage full-text retrieval scheme based on homomorphic encryption is proposed. Based on the integer vector encryption technology, the scheme establishes a vector space model, and then calculates the cosine similarity between the search vector and the document vector in ciphertext for retrieval. The scheme utilizes the homomorphism of the encryption algorithm. During the process of uploading files, retrieving and downloading files, the cloud server cannot obtain plaintext data, and the scheme can perform multi-keyword retrieval. It has accurate and higher retrieval efficiency in the third-party untrusted cloud storage scenario. The scheme description is simple, ensuring the confidentiality of user data, and has good application in practical applications.

Key words: cloud storage, homomorphism, vector space model, integer vector encryption, multiple keywords