Identity Based Privacy Preserving Dynamic Broadcast Encryption for Multi-privileged Groups

Abstract

An identity-based broadcast encryption scheme (IBBE), is the one in which the broadcasting sender combines the public identities of receivers and system parameters and then encrypts a message. Attacks on user privacy may happen as the user identity is not preserved. This paper presents an IBBE scheme for multi-privileged users using Chinese Remainder Theorem and bilinear pairing that preserves the user identities. The proposed scheme is proved secure under random oracle model. The proposed scheme provides a stateless broadcast, is dynamic with ease for revocation of users and also collusion resistant.