Research And Design Of Internet Of Things Intelligent Terminal Data Access System Based On Block Chain

With the development of Internet of Things(Io T)technology,the application of wearable intelligent terminals is becoming more and more extensive.As the core carrier of the Io T,the wearable intelligent terminals can collect various data,such as human location information,health status and so on.The traditional information management method is to store the data collected by the intelligent terminals in a centralized database.Once the centralized device is maliciously attacked by a hacker,or the administrator who owns the data will tamper with the data,which will affect the entire information system.It is said to be a catastrophic impact,which seriously undermines the security of data privacy and makes people unable to fully believe the authenticity of these data.As a decentralized distributed ledger technology,blockchain allows data to be shared,synchronized,and copied among network members.In other words,it enjoys the characteristics of decentralization,tamper resistance,and traceability.Focusing the shortcomings of traditional Io T intelligent terminal data storage in a centralized database,this thesis carries out research works on the blockchain technology and proposes a blockchain-based Io T intelligent terminal data access system scheme,which allows intelligent terminals to connect with the blockchain system,store the data in the blockchain and achieve the decentralized and distributed management of the data.The content of this thesis includes the following aspects.1.First,based on the problem of data security storage,this thesis applies the blockchain technology on the Io T information security so as to eliminate the hidden dangers of data storage in the centralized equipments.Second,a blockchain-based Io T intelligent terminal data access system is designed through research on the underlying technology of the blockchain.Third,the on-chain storage of data is completed to ensure data security through the development and deployment of smart contract applications.2.This thesis also studies the blockchain consensus algorithm.Most of the existing blockchain consensus algorithms cannot fulfill the requirements of performance,decentralization and security at the same time,but to the utmost extent,they can only meet two of them.As a commonly used blockchain consensus algorithm,the Practical Byzantine Fault Tolerance(PBFT)algorithm that is very suitable for the Io T application scenarios in terms of security and decentralization,but it has some disadvantages such as nodes cannot dynamically join and exit,and poor performance.Thus,the PBFT algorithm cannot meet the actual application requirements of the massive data access of the Io T and the large changes in nodes.This thesis proposes an improved scheme of the PBFT algorithm based on the Schnorr group signature,which solves the problem of dynamic node joining and exiting through group signature,and also reduces the communication complexity and improves system throughput.