Efficient trust based information sharing schemes over distributed collaborative networks

In distributed collaborative networks such as peer-to-peer systems and wireless ad hoc networks, secure communications, information sharing and dissemination heavily depend on effective trust management. Recently, trust based encryption (TBE) has been proposed to deal with secure information sharing and dissemination for such networks. Unfortunately, the previously proposed schemes are not efficient in terms of communications overhead. In this paper, we provide a trust based encryption schemes which can significantly improve the communication overhead. The proposed scheme is based on a recently proposed revocable identity based encryption technique which can reduce the communication overhead at the central trust authority from the linear order of the number of the users in the network to the linear order of the number of the revoked users.