Fuzzy Searchable Encryption Scheme Based On Chinese Keyword In Cloud Environment

As cloud computing becomes more mature,more and more users choose to store data on the cloud server.Because the cloud is not fully trusted,to protect the confidentiality of data at the same time provide query privacy become a hot research problem of cloud storage.Searchable encryption schemes are presented to provide a feasible way to solve the problem of cloud storage.However,fuzzy keywords searchable encryption scheme especially for Chinese keywords fuzzy searchable encryption scheme is still a topic worth further study.This paper focuses on Chinese keywords fuzzy searchable encryption and expands the research work.The main work includes the following three parts.First of all,by analyzing the characteristics of the Chinese,studied the construction method of Chinese fuzzy set.According to the three methods of constructing fuzzy sets,the paper gave three construction method of Chinese fuzzy sets.One was based on a wildcard characters Chinese fuzzy set method,this method was simple and easy to construct;another was based on pinyin fuzzy set method,the second method involved the considerations of the measurement from a single Chinese character refined to based on the structure of pinyin;the third method was based on improved pinyin dictionary fuzzy set method,this method was based on more detailed definition rule for calculating the edit distance,and spelt check after constructing pinyin string,reduced the size of the fuzzy set.Analyzed through the simulation experiment result,based on a wildcard characters of Chinese fuzzy set and based on improved pinyin fuzzy set method space and time consumption was relatively low.Secondly,based on the structure of the fuzzy sets method in Chinese in this paper,proposed an efficient and verifiable Chinese fuzzy searchable encryption scheme.In this scheme,the given model made data owners and users no longer bear the heavy tasks,the private cloud server completed the construction of Chinese keywords fuzzy set and index,thus improved the efficiency of the whole system.By constructing the valid verification algorithm,to verify the search results,which returned by public cloud server,improved the reliability of the scheme.The simulation results showed that the efficiency of the scheme,and based on the improved pinyin fuzzy set method is more efficient.Finally,extended the functionality of the efficient and verifiable Chinese fuzzy searchable encryption scheme.Ranked search was added in the scheme,Through the improved TF-IDF rules,designed a Chinese keyword fuzzy searchable encryption scheme,which was supported sorting.Provided a more effective searchable results,and then reduced some unnecessary consumption of time and bandwidth.