In order to securely transmit the privacy information to authorized users’ set through the unsafe channel, an identity-based broadcast signcryption scheme (IBSC) based on Selvi IBBSC scheme was proposed. In the IBSC, the ID-based signcryption scheme for broadcast communication’ schema was put up，and using bilinear pairing on elliptic curves, a new secure, efficiently identity-based broadcast signcryption scheme was proposed. Firstly the correction was analyzed, and then signcryption schemes were proven to be secure against adaptive chosen ciphertext attacks and adaptive chosen message attacks under decisional bilinear Diffie-Hellman assumption and computational Diffie-Hellman assumption respectively. Lastly the efficiency of IBSC was analyzed simply. The results showed that the proposed scheme, which provids the efficient solution to the dual problem of confidentiality and authentication, is secure in the random oracle model and could efficiently improve the security of Broadcast network, and more efficient in reducing the broadcasting parameter and the computing consumption of Designcypt.
