Design and Implementation of IoT Gateway Security System

With the rapid development of the Internet of Things (IoT) technology, massive terminal devices access the network. These devices often have limited computing power, insufficient resource space, and poor security protection capabilities, which are easily exploited by hackers and lead to serious security incidents. IoT gateway is a network access device, which can be designed with a relatively complete security mechanism to effectively improve the security protection level of the system. Based on the open source OpenWrt system, this paper adopts the modular design structure, realizes the identity authentication and encryption communication between the sensing layer and the network layer through China cryptographic algorithm, network security protocol and Physical Unclonable Function (PUF), designs the software and hardware and builds the test environment. The results show that the gateway has strong security and stability, which can resist DDOS attacks and spoofing attacks, and has flexible network access modes and deployments, meeting the requirements of data collection, device management and multimedia converged communication in the IoT environment.