Research On Privacy Preserving Of Searchable Encryption

Nowadays,cloud computing has been applied as a mature technology in various fields.Under the premise of the geometric multiples of data growth,users start to upload a large amount of data to the cloud server,and cloud storage is widely used.Because of its advantages of reducing the overhead of local storage devices and reducing the cost of data management,users are more likely to keep their data in the cloud.How to ensure that data security and privacy stored in the cloud has become an important problem.Encrypting the data and uploading it to the cloud server is a solution.However,due to the indistinguishability of data encryption,users cannot accurately determine which data is needed when they need to obtain the required data again.Researchers proposed a new type of cryptographic primitive searchable encryption(SE)based on ciphertext information search.Searchable encryption can make full use of computing resources of the cloud server to search ciphertext.This paper mainly studies the privacy protection scheme of searchable encryption mechanism,First of all,this article analyzes and compares existing searchable encryption schemes,and it divides the existing privacy problems of searchable encryption scheme into data privacy protection(index privacy protection,access pattern privacy protection,search pattern privacy protection)and identity privacy protection anonymity),then it summarizes some existing privacy protection and provides a reference for the privacy protection technology of searchable encryption scheme.Secondly,this paper establishes the definition of privacy protection for the privacy protection of the searchable encryption mechanism because the security definition of the existing searchable encryption mechanism only addresses the issue of index privacy,and it gives the relationship between privacy protection and searchable encryption,which provides a theoretical basis for the privacy protection technology of the searchable encryption scheme.Thirdly,a series of attack methods are given for the privacy problems of the searchable encryption mechanism.These methods can cause the search pattern privacy,access pattern privacy and indentity privacy in a searchable encryption scheme to be leaked.Fourthly,a set of privacy protection scheme is proposed for the privacyprotection of the searchable encryption mechanism.The main objectives are:(1)To ensure that data privacy is not compromised by generating trapdoor and query results through probability;2)using rerouting encryption technology to ensure identity privacy is not leaked.In addition to the privacy protection protocol applied to the application model proposed in this article,it can be extended to other searchable application models with scalability.After the scheme was also made a proof of privacy.Finally,existed searchable encryption schemes are analyed and summarzed,this paper provides design principles and security analysis methods for the privacy protection of searchable encryption schemes,and also prospects the future research directions of future searchable encryption.