Research On Performance Optimization Technology Of Chinese Multi-keyword Ciphertext Retrieval

As an outsourced storage method,cloud storage is favored due to its scalability,flexibility,and low cost.But at the same time,the security of cloud data is also facing challenges.In order to protect data privacy,the data owner encrypts the data on the client side before uploading it to the cloud.However,the searchability of ciphertext data is poor.In order to improve the efficiency of retrieval,researchers have proposed ciphertext retrieval technology.Most of the current ciphertext retrieval systems are aimed at the retrieval of English ciphertexts,which have problems such as low retrieval efficiency and insufficient security.Therefore,it is imperative to propose a high-performance ciphertext precise retrieval system with the theme of Chinese ciphertext retrieval.In addition,in order to solve the problem of low retrieval accuracy caused by input errors,it is particularly important to propose a Chinese keyword fuzzy set construction method with a high degree of fuzziness.First of all,in order to solve the problems of low retrieval efficiency,insufficient query accuracy and insufficient security of the scheme based on the security multi-keyword searchable encryption technology based on priority sorting when the ciphertext file size is large,a Chinese multi-keyword ciphertext precise retrieval efficiency optimization methods is proposed.By studying the characteristics of part-of-speech and the location of keywords,a precise retrieval scheme for multi-keyword ciphertext based on part-of-speech chunking is designed and implemented.By comparing with the secure multi-keyword searchable encryption technology scheme based on priority sorting,it is verified that the precise retrieval method of multi-keyword ciphertext based on part-of-speech segmentation can effectively improve the efficiency of ciphertext retrieval and system security.Secondly,aiming at the problems of insufficient fuzzy degree and low recall rate of ciphertext fuzzy retrieval technology based on Chinese keywords,a capability enhancement method for Chinese multi-keyword ciphertext fuzzy retrieval is proposed.Through the study of Chinese pinyin,synonyms and edit distance,a fuzzy retrieval scheme for ciphertext based on letter-keyboard distance is designed and implemented.By comparing with the ciphertext fuzzy retrieval technology based on Chinese keywords,it is verified that the ciphertext fuzzy retrieval method based on the distance between letters and keyboards can effectively improve the fuzzy degree of keyword ciphertext retrieval fuzzy set and the retrieval recall and precision.