Research On Secure Data Storage Of Internet Of Things Based On Blockchain

With the rapid development of Internet of Things technology,the data collected by the Internet of Things has brought convenience and customized services to people,but it also faces increasingly serious security and privacy issues.The current centralized Io T data storage and management model has trust issues such as data leakage,data tampering,and opaque data operations.In this context,the decentralized nature of blockchain provides a new approach for secure data storage of Io T.This thesis studies the secure data storage technology of Io T based on blockchain from two aspects: data storage and access control.The main research work includes:(1)The trusted storage methods for Io T data based on blockchain have been researched.A data authenticity verification method is proposed to address the issue of false data injection by binding device identity with data,and a secure and lightweight encryption algorithm is selected to ensure data confidentiality.In order to avoid data tampering issues,a trusted storage method combining blockchain with Inter Planettary File System is proposed to ensure that blockchain has sufficient capacity to reliably store Io T data.An authenticity verification method for data storage operations is proposed to ensure the trustworthiness of stored procedures.(2)The decentralized Io T data access control methods based on blockchain have been researched.A decentralized attribute based access control model that empowers data owners with control over their own data is proposed.In order to ensure the openness,transparency,and auditability of access control,trust management is implemented for attribute publishing,policy publishing,and access operations during the access control process.Authenticity verification algorithms for three types of operations are proposed.In order to improve the efficiency of decentralized access control models,polynomial function access tree and static attribute token are proposed,which accelerate the speed of policy evaluation and permission verification.Performance analysis shows the effectiveness of this optimization.The thesis simulates and implements a blockchain based secure Io T data storage system from the aspects of building a simulation experimental environment,overall system implementation architecture,design of functional modules and test cases,and front-end interface call function interfaces.The test results show the effectiveness of the proposed method and model in this thesis.