With the rapid development of the Internet of Thing (IoT), more and more IoT devices have accessed to the IoT system, and the IoT architecture has evolved from vertical integration to horizontal structure, which causes the devices from different systems or different IoT domains can not trust each other in process of interacting. How to ensure the authentication between different system and domain in IoT has become an urgent problem to be solved. This paper proposes a master-slave chain based trusted cross-domain authentication mechanism in IoT to improve the efficiency and credibility of authentication. In this system, a master-slave blockchain architecture supporting distributed cross-domain authentication is designed. Then, an improved Byzantine Fault Tolerance based on reputation value model (RIBFT)is proposed for trusted authentication and data traceability. The security and performance analysis show that our scheme could effectively improve the efficiency and credibility of authentication for IoT devices. In addition, the model is also used in practical applications.

随着物联网的飞速发展，越来越多的物联网设备接入物联网系统，物联网架构从垂直集成发展到水平结构，使得来自不同系统或不同物联网域的设备可以在互动过程中彼此不信任。如何确保物联网中不同系统和域之间的认证已经成为亟待解决的问题。本文提出了一种基于主从链的物联网可信跨域认证机制，以提高认证的效率和可信度。在该系统中，设计了一种支持分布式跨域认证的主从区块链架构。然后，提出了一种基于信誉值模型（RIBFT）的拜占庭式容错算法，用于可信认证和数据追溯。安全性和性能分析表明，我们的方案可以有效提高物联网设备认证的效率和可信度。此外，该模型还用于实际应用中。