Research On Distributed Identity Authentication Mechanism Of IoT Devices Based On Blockchain

In recent years,with the rapid development of the Internet of Things technology,the applications of the Io T have become more common and play an important role in today's society.But at the same time,the centralized Internet of Things device management model also causes new problems.Firstly,the current centralized platforms of the Internet of Things are incompatible with each other,which makes it difficult to collaborate and share information among Io T devices on different platforms.Secondly,due to the wide distribution of devices,complex application environment,limited computing and storage capacity and other characteristics,the authentication and access efficiency is low.In addition,Io T devices have poor resistance to malicious attacks,and private data is easy to be leaked.With the development of industrial Io T in our country,the number of Io T devices will grow rapidly in the future,with a larger application scale and higher security requirements.Therefore,it is urgent to study distributed identity authentication and trusted access technology for Io T devices.The research of this thesis is based on the above-mentioned issues and the main contents are as follows:(1)In order to solve the problems of low compatibility and weak anti-attack ability of the centralized management platform of the Io T in the process of device identity authentication,a distributed Io T device identity authentication architecture based on blockchain was proposed.The digital identity and other information were stored in the novel block data structure,and combined with the relevant knowledge of cryptography,the distributed identity authentication mechanism of Io T devices was proposed,and the detailed process of certificate issuance and identity authentication was designed.The security analysis and performance comparison analysis of the proposed mechanism show that the proposed authentication mechanism can resist multiple malicious attacks,can achieve highly secure distributed Io T authentication,and has advantages in terms of computing and storage overhead.(2)In order to solve the problems of complex certificate issuing process and weak privacy protection in distributed authentication scheme,an anonymous authentication architecture of Io T based on ring signature and blockchain was proposed.Based on the scenario of the Internet of Vehicles,the vehicle identity information was stored in the blockchain.Combined with the principle of ring signature,a safe and efficient anonymous authentication mechanism of the Io T was proposed,the detailed process of registration,ring list update and identity authentication were designed as well.The security analysis and performance comparison analysis of the proposed mechanism were carried out.The results show that the proposed authentication mechanism has strong privacy protection ability,can realize the secure anonymous authentication between vehicles,and has high authentication efficiency,which can meet the real-time requirements of communication in the scenario of Internet of Vehicles.(3)An identity authentication system based on digital certificate and blockchain was designed and implemented.The system consists of three functional modules: proxy server,smart car and Hyper Ledger blockchain.Smart car is the main body of identity authentication;The proxy server generates or verifies signatures on behalf of vehicles and is responsible for sending and receiving vehicle data information;The Hyper Ledger is used to store vehicle signature information.The functional test results show that the functions of vehicle information sending and receiving,server proxy signature and verification,Hyper Ledger storage and traceability were achieved,and the system can realize security authentication and information transmission between vehicles.