Research On Sensitive Data Protect And Exchange Method Of Internet Of Things Based On Cross-Chain Technology

Blockchain technology with features of point-to-point transmission,decentralized computing and secure encryption provides a new solution for the secure exchange of sensitive data in the Internet of Things(Io T).However,various Io T Blockchains constructed by different organizations or institutions are limited by each single "information island",so it is difficult to exchange valuable sensitive data between blockchains.Cross-Chain technology can break through the gap of data exchange between chains and provide support for multi-chain data exchange of Io T.However,in the protection and exchange of sensitive data in Io T,there are still two key issues that have not been completely solved: 1.Data security exchange between Io T Blockchains;2.Security protection of sensitive data exchange in Io T.In view of the above problems,this paper proposes a solution for the protection and exchange of sensitive data of Io T based on Cross-Chain technology from two aspects: the secure Cross-Chain exchange of Io T data;the security protection of sensitive data exchange.The main contributions and innovations of this paper are as follows:1.In terms of the Cross-Chain exchange of Io T data,this paper proposes a Cross-Chain exchange method of Io T data based on Permissioned Blockchain,aiming at the problem that it is difficult to exchange data between various Io T Blockchains based on Permissioned Blockchain.In the method,the Channel Matching Scheme for Cross-Chain realizes the mutual trust connection between multiple Permissioned Blockchains by Anchor-Relay Chain and Multi-Blockchain Communication and Consociation Protocol.The Cross-Chain exchange of data information is realized by creating a Peer Matched Channel between peers on different blockchains.This model can not only satisfy the Cross-Chain exchange of Io T data in a trusted environment,but also guarantee the non-tampering records and security of Cross-Chain exchange data through the blockchain feature of PMC channel.2.In terms of the protection of sensitive data exchange in Io T,because of the low security level of Io T device information and security risk of data protection,it is not conducive to securely exchange sensitive data between multiple Io T Blockchains.In view of the above problem,this paper proposes a method for protecting and exchanging sensitive data of Io T nodes based on Cross-Chain technology.In the method,Homomorphic Consortium Blockchain for SHS Node Identity Authentication and Privacy Data Preserving,constructs the Io T data acquisition blockchain and Io T data supervision blockchain,and creates a data Cross-Chain channel between two chains.Through the proposed Authentication Management and Verification Service Organization,the verification and management of device node authentication is realized.Through the design of Block Structure Based on Homomorphic Encryption and Node signature,the sensitive data is protected by secure encryption and its ownership is guaranteed.Through the above design,the model builds a trusted data exchange environment for Io T.At the same time,two sub-chains of data acquisition chain and data monitoring chain are realized through the designed data Cross-Chain channel,including the secure cross-chain exchange of sensitive data such as encryption key,signature packet and sensitive data information block.In the trusted environment created by the supervision of Io T devices,this model can secure and protect sensitive data by encryption and secure exchange it between two sub-chains.