Cooperative Authentication Scheme for Heterogeneous Networks Based on Identity Group Signature and Blockchain

With the expansion of the network scale and the diversity of the network structure, the data processing pressure of the network devices surges, and at the same time, the access security and privacy protection problems of the network devices are significant. Therefore, we propose an identity-based group signature algorithm using SM9 algorithm to protect the access paths privacy of the devices, and then further design a cooperative authentication scheme for heterogeneous with the proposed algorithm and coalition blockchain. The proposed authentication scheme can ensure free access of the devices in heterogeneous networks with the limited number of access parameters. Compared with other state-of-the-art provably secure algorithms under the random oracle model, the proposed algorithm achieves higher efficiency. Besides, the cost analysis of storage and processing on the blockchain shows that the proposed scheme can reduce the storage overhead more than 35% in the access network and the core network.