A Multi-message and Multi-receiver Hybrid Signcryption Scheme for CATV Network

Recently, many multi-receiver signcryption schemes have been proposed. However, few schemes can send multimessages to multi-receivers, which is an important requirement for the cable television (CATV) networks. In this paper, to cope with the above problem, we present a multi-message and multi-receiver hybrid signcryption scheme based on the assumptions of a discrete logarithm and Gap Diffie Hellman. Our scheme makes it impossible that an attack derives the plaintext or forges signatures. The accuracy and efficiency of the new scheme are analyzed. There is no pairings computation in the proposed scheme. We prove that our scheme is secure against adaptive chosen ciphertext attack and existentially unforgeable against a chosen message attack. Finally, we present a broadcast service protocol for CATV network by employing our proposed scheme.