A Ciphertext Data Retrieval Method Based on Cloud Storage

For the problem of mass data encryption retrieval in the cloud storage system, a three-step ciphertext data retrieval method is proposed. In this method, we introduce inverted index as the index structure, adopt the fully homomorphic and privacy homomorphism encryption algorithm and design a three-step retrieval strategy. The first step matches on the ciphertext index precisely, and the other two extend the word into other forms and correct the wrong word to query again. The latter two steps will be executed under the circumstance that the returned result is lower than the pre-set threshold. This ciphertext data retrieval method based on cloud storage improve the privacy of stored data and makes every effort to render users obtain the result they expect. The proof shows it is effective.