Abstract
Blockchain is an innovated and revolutionized technology, which has attracted wide attention from academia and industry. At present, blockchain has been widely used in certificate management and credential delivery in network access authentication. In a large-scale multidomain Internet of Things (IoT) environment, one of the important issues is cross-domain key sharing and secure data exchange between different IoT. In this paper, aiming at the multidomain authentication requirements of the IoT, this paper introduces the blockchain cross-chain technology into the cross-domain authentication process of the IoT and proposes an effective cross-domain authentication scheme of the IoT based on the improved PBFT algorithm. First, an architecture of blockchain-based cross-domain authentication is proposed. Then, the block data structure is designed in order to enhance the function of access authentication. Third, the authentication process is realized by intelligent contract. The authentication information is encrypted and distributed by a key sharing method to ensure the security of authentication data. Simulation results show that the proposed scheme has significant advantages in security and availability.