VMSE: Verifiable multi-keyword searchable encryption in multi-user setting supporting keywords updating

Abstract

Since the powerful storage capacity of the cloud platform, more and more people are willing to store their files on the cloud service provider (CSP). In order to prevent the privacy of outsourced files from being leaked, data owners will encrypt files before uploading. However, encryption will significantly limit the accurate location of the files. Therefore, this paper mainly introduces a verifiable multi-keyword searchable encryption scheme supporting keywords updating (VMSE). First of all, our proposed VMSE scheme can achieve multiple keywords search while protecting the privacy of the outsourced files and users. Then, our VMSE scheme can also implement the integrity verification and decryption of search results, which are not considered in many existing multi-keyword searchable encryption schemes. Currently, the dynamics in search schemes mostly refer to the dynamic update of outsourced files or user’s search permissions. We consider the keyword dynamic update of outsourced files in this paper, which is a design challenge for searchable encryption schemes and achieved by few searchable encryption schemes. Finally, performance evaluation shows our scheme is efficient and feasible in practical application.