A Multi-authority Attribute-Based Encryption Access Control for Social Network

In order to solve the problems of privacy protection and the user revokes in social network, a multi-authority attribute-based encryption access control for social network is presented. In the proposed scheme, we utilizes the linear secret sharing scheme and the proxy re-encryption technique to achieve the user rights update and support flexible access control strategy. Multiple authorities jointly distributes the attribute key of a user so that it effectively avoid the security risk caused by the excessive power of a single authorized center. Furthermore, by introducing decryption outsourcing technology, it can effectively reduce the computational overhead of users. The results show that this scheme has high performance on decryption operations, and the communication cost is small in terms of user revocation.