Research on intelligent Terminal authentication Strategy based on block chain

In the face of huge Internet of Things (IoT) application scenarios, although trusted access and management of IoT devices can be realized through a single blockchain, there are problems of increased time consumption and low throughput. To solve the above problems, this paper proposes an IoT device authentication strategy based on master-slave chain structure. Firstly, the master-slave chain network structure of IoT device authentication is proposed based on blockchain technology. Secondly, the reputation evaluation mechanism is introduced to estimate the reputation value of slave chain nodes and IoT devices, so as to provide basis for the selection of consensus nodes. Thirdly, by selecting the consensus node with high reputation value and optimizing the consensus stage, the Practical Byzantine Fault Tolerance (PBFT) consensus algorithm is improved to increase the consensus throughput and improve the consensus efficiency of the authentication process. Finally, the authentication smart contract is designed to ensure fair and credible implementation of authentication rules. Security analysis shows that these strategies have high security against mainstream IoT attacks, reduce the delay of authentication request, and improve the efficiency and stability of authentication.