Research On The Ciphertext Search Based On Fuzzy Keyword In Cloud Computing Environment

With the rapid development of cloud computing, users begin to store data to the cloud server. In order to ensure data security and user privacy, data are generally stored in the cloud server as ciphertext. However, users will face a tough issue about searching based on ciphertext. The conventional method only supports precise keyword search. But it is inevitable that the input does not exactly match the pre-set keyword because of user's slight input error. Fuzzy search widely applied in the plaintext now can not be directly applied in the search based on ciphertext. Hence, designing the ciphertext search mechanism based on fuzzy keyword is an urgent study.For the problem of ciphertext search based on fuzzy keywords, this paper proposed a number of safe and efficient search program, and the proposed solution has been further improved. The main research work and achievements of this paper are:1) To research and organize the researchers' current work for ciphertext research, this paper proposed a ciphertext search architecture based on cloud storage, based on the choice of ciphertext search method based on index, this paper designed a fuzzy search for a ciphertext system architecture.2) Through the edit important observation from the similarity in standard form, we designed a more advanced technology to build efficient storage of fuzzy set of keywords, namely, to build technology-based wildcards fuzzy set of keywords. And to compare with the intuitive construction techniques and the building technology based on gram through storage complex. Finally, through mathematical proof, this paper proved the proposed technology to build the fuzzy keywords based on wildcards is of completeness and reliability.3) Construction technology is based on a wildcard fuzzy set of keywords, this paper further proposes a new trie-based index symbol of the ciphertext search program, which trie multiplex structure constructed using a set of formal symbols to represent fuzzy result set of keywords.4) On the basis of previously proposed scheme, based on the similarity of the results of this paper for sorting and multi-user application scenarios for the two aspects of the improvement, the results are based on the similarity of the sort, it uses a set of keywords based on fuzzy wildcard building technology similarity to identify and exploit the results of the number of wildcards, so that sort. For multi-user scenarios, we use more than the increase in cloud server an authentication key to solve the security problems generated by legitimate users to be canceled after authorization.5) through a rigorous security analysis, we prove that the proposed scheme is in front with security and privacy in order to properly achieve the ciphertext fuzzy keyword search target. The results of this simulation experiment also demonstrates the efficiency of the proposed search program.Finally, we conducted a general summary of the full text, and the ciphertext fuzzy search conducted research future.