Research On IoT Security Technology Based On Blockchain

In recent years,the rapid development of network communications,4G and 5G technologies have brought higher network speeds and more communication needs.The Internet of Things technology has been widely used in areas such as the sharing economy,medical care,and smart cities,and has become more important..However,currently a large number of IoT devices do not have a security authentication mechanism,which causes the trust problem between devices to become more serious.At the same time,when facing centralized management mechanisms in the face of tens or even hundreds of millions of connections,it needs to face stability and security guarantees.Consumption of huge resources and extremely serious security threats.As a distributed security technology,blockchain can provide a secure and trusted interactive environment for the Internet of Things.This paper proposes a network model of blockchain combined with the Internet of Things,and combined with the characteristics of the Internet of Things,using blockchain technology to provide a safe and efficient operation guarantee.The research content of this article is as follows:1)Aiming at the problems that the current Internet of Things environment is not secure,efficient enough,and lack of mutual trust between devices,this paper improves the block structure and proposes a network topology model that combines the blockchain with the Internet of Things.The registration and update policies of the gateway nodes are described.Can improve the security and credibility of IoT device authentication.At the same time,this paper also refers to the DH key exchange method,and proposes a key exchange algorithm that can balance the computing power between nodes.It can make more efficient use of computing resources between networks while ensuring security,compared with traditional keys.The exchange algorithm requires less connection time between nodes.2)Aiming at the problems of many types of current IoT devices,inadequate automation of identity and other interactions.and inefficient information sharing between nodes,a multi-layer smart contract model based on blockchain was proposed,and related algorithms and incentive mechanisms were designed.Compared with the traditional IoT network,this contract model is more secure,more automated,and it can also use information between nodes more efficiently.The above work has been simulated or theoretically analyzed,and the results show that the blockchain-based IoT model can achieve secure interaction and efficient identity authentication between IoT nodes,which can effectively solve the current lack of security and efficiency of the IoT,lack of mutual trust between devices,and The problem of insufficient information sharing.