Shared and searchable encrypted data for semi-trusted servers with controllable sharing property

Abstract

To support encrypted data sharing and searching between multiple users in the remote data storage server, in 2011, Dong et al. proposed a scheme for data encryption with keyword search in multi-user (all-user) settings. The scheme allows all authorized users to share their encrypted data. The encrypted data can be searched using keyword search method by all users. The keyword search method makes the server find the encrypted data containing encrypted keywords without decrypting them, so information of both the data and the keywords is not exposed to the server. However, the scheme only considered a scenario sharing all stored data with users, and did not consider a case for storing private data in the server. In this work, we modify the Dong et al.’s scheme to propose a scheme that a user can select his private data when he wants to share them with all users in the system.