Research On Blockchain-based IoT Sensing Data Protection And Sharing Method In Buildings

IoT in buildings provides important sensing technical support for smart buildings,and enables real-time data processing and analysis capabilities after integrating cloud computing,artificial intelligence and other technologies.However,the sensing data collected by Io T devices in buildings are usually held by their managers,so it is difficult for regulator authority to verify the authenticity and integrity of data.In addition,centralized and isolated databases not only increase the cost of data management,but also pose high security risks.For Io T in buildings,the current blockchain-based data management scheme has the following problems: 1.In the consensus layer,blockchain systems based on traditional consensus opposes each other in decentralization and efficiency,and it is difficult to take into account the security and throughput requirements of sensing data;2.In the network layer,the presence of untrusted nodes in peer-to-peer network weakens the resistance of blockchain systems and threatens the security,reliability and storage efficiency of Io T sensing data in buildings;3.In the application layer,Io T in buildings involves a large amount of sensitive data,which leads to the redundant storage burden of distributed servers,and the openness and transparent ledger in blockchain cannot provide privacy protection for sensing data.In view of the above problems,this paper studies the blockchain-based Io T sensing data protection and sharing method in buildings.The main work is as follows:1)A blockchain-based framework of Io T in buildings is proposed,in which Io T devices in buildings are selected as nodes according to their behavior ability,and the distributed security of peer-to-peer networks is expanded by using the idle performance of devices.A credibility mechanism integrating nodes behavior and peer trust is designed to evaluate the credibility of each node in the peer-to-peer network by integrating various behavioral factors and potential trends.And an improved Proof-of-Authority(Po A)consensus algorithm is designed based on credibility mechanism.The system can adaptively adjust the consensus identity update cycle according to the performance of the current consensus nodes,realizing a highly efficient consensus algorithm with distributed characteristics,which meets the needs of Io T in buildings.2)A smart contract based Io T sensing data protection and sharing method in buildings is designed.Each user responsible for sensing data storage and protection will obtain the identity key based on the asymmetric encryption algorithm.The smart contract is modularized based on functionality and provides call interface for key holders with access rights of each module.Finally,a data protection and sharing method with low complexity and whole-process encryption is realized.3)A blockchain-based Io T system for building security is developed,it builds a consortium chain based on improved Po A consensus,and mounts a smart contract suitable for Io T sensing data protection and sharing in buildings.In addition,the system has built-in a device positioning and anti-theft method based on the location characteristics of Io T in buildings,and finally constructs a sensing data management scheme for Io T in buildings with multi-party participation,reliable data and lightweight storage.