INTERNET OF THINGS ACCESS CONTROL IDENTITY AUTHENTICATION METHOD BASED ON BLOCKCHAIN

At present, Internet of Things (IoT) is widely used, which requires high security of network communication and data transmission. The terminal devices of IoT need mutual identification and identity authentication to ensure network security and data security. Identity authentication is the first line of defense ofIoT security. The existing traditional public key infrastructure (PKI) is cumbersome and computationally intensive and cannot meet the needs of the open and distributed IoT environment with limited resources. In this paper, a two-way identity authentication mechanism of IoT terminal based on Blockchain is designed by using SM9 ID cipher algorithm. The scheme uses device ID as the public key, which simplifies the key distribution management process. In addition, based on the assumptions of computational Diffie-Hellman difficulty, q-Diffie-Hellman inverse problem and bilinear Diffie-Hellman difficulty problem, it can greatly meet the confidentiality and unforgeability, and thus is more in line with the practical application environment of IoT. Through simulation experiments to verify and analyze, and comparing several mainstream authentication methods at present, the identity authentication scheme based on SM9 identity cryptographic algorithm and blockchain technology in the IoTs environment can meet the requirements of time, performance and security.