- 期刊
An Efficient and Secure Cipher-Text Retrieval Scheme Based on Mixed Homomorphic Encryption and Multi-Attribute Sorting Method Under Cloud Environment
摘要
Cipher-text retrieval plays an important role in data encryption storage service under cloud environment. The present sorting search algorithms have low precision due to corresponding score computing with single local at- tribute, which cannot accurately sort according to the similarity. To solve this problem, we propose an efficient and secure cipher-text retrieval scheme based on mixed homomorphic encryption and multi-attribute sorting method under cloud environment. This new scheme is divided into four steps: 1) Constructing multiple attribute characteristic vector safety index for documents; 2) Constructing reverse index for the uploaded documents and generating vector set of document, then computing module of each document vector; 3) Encrypting document vector set with homomorphic encryption and uploading them into cloud; 4) Adopting multiple attribute score formula to calculate document relevance score, according to the scores ranking to return the interesting retrieval results for users. Experiments show that our method has the higher retrieval speed and the better retrieval efficiency under cloud environment.