A Multi-user Searchable Symmetric Encryption Scheme for Cloud Storage System

How to effectively achieve key-sharing and access authorization is an urgent need of cloud storage. Focused on this issue, we propose a new multi-user searchable symmetric encryption scheme. The new scheme is a conjunction of single user searchable symmetric encryption scheme and identifier-based encryption algorithm, a new data structure is designed to fit our purpose. The new scheme provides the confidentiality of keyword to be searched, and achieves the access controllability of the files, and is a multi user searchable scheme, it has the property of unforgeability of the search trapdoor, and is of dynamic addition and revocation of authorized user.