Research On Key Management Scheme Of Internet Of Things Based On Blockchain

The increasing progress of communication technology,especially the rapid development of 5G technology,has brought new vitality to Io T.Io T technology has been widely used in medical,industrial,smart city and other fields,and gradually integrated into people’s daily work and life.However,as the scale of Io T expands,the security problem of Io T is becoming more and more serious.At present,a large number of Io T devices have no security authentication mechanism,and traditional key management methods usually rely on a centralized trusted third party,with insufficient security,poor scalability,non-transparent and other problems.The introduction of blockchain technology provides a new idea to solve the security problems faced by Io T.Because of its decentralized and tamper-evident features,blockchain can provide a secure interaction environment for the Io T.In this paper,we introduce blockchain technology into the Io T field and study the centralized blockchain Io T architecture to improve the security and trustworthiness of data interaction in the Io T.The main work of this paper is as follows:(1)A routing-driven Io T key management scheme with an identity-based certificate authentication system IBCAS is proposed.Aiming at the binding problem between nodes and public keys in the key management scheme of Io T sensing nodes,and facing the characteristics of fragile security and limited resources of sensing nodes in Io T networks,the identification key pair of nodes is used as the verification key to verifying the random key pairs generated by nodes independently,and the whole process does not require the intervention of trusted third parties.In the scheme,only shared keys are established for neighboring sensing nodes that communicate with each other to ensure the security of sensing nodes and the lightweight nature of storage overhead.(2)A blockchain-based Io T key management scheme is proposed.To address the current problem that the trusted interaction between Io T devices relies heavily on centralized management,the key generation method is encapsulated in the blockchain in the form of smart contracts.When the preset conditions are triggered,the key can be automatically generated to ensure the noninterference and trustworthiness of key generation;the generated public key is output in the transaction result,and the public key is obtained through the transaction result.The scheme can effectively reduce the communication overhead of key distribution and the storage overhead of key preservation,ensure the security of the key transmission process and improve the reliability of the key management process.Based on the analysis and summary of various shortcomings and security problems of existing Io T,this paper proposes an Io T key management scheme,which can effectively solve some problems of traditional key management methods.The experimental analysis proves that the scheme can provide better security,effectively reduce the storage space and energy consumption of sensing nodes,have higher advantages in security and performance,and rely on the tamper-evident and distributed characteristics of blockchain technology to achieve secure and configurable key management and authorization,which is more suitable for Io T systems with many nodes and limited resources.