Research On Efficient Cross Heterogeneous Domain Identity Authentication Based On Blockchain Technology

In the context of big data,cross-domain authentication plays an increasingly critical role for data security sharing.However,traditional cross-domain authentication methods built on centralized organizations include certificate-based public key infrastructure(PKI)and identity-based passwords institutions(IBC)and kerberos based on trusted credentials have brought about data monopolies,privacy violations,unfair distribution of rights and interests,and low authentication efficiency.These problems have become more and more obvious,and cannot meet the data security needs in a big data environment.As an emerging technology,blockchain's innovative distributed de-intermediation trust system has changed the traditional Internet's mechanism of relying on centralized institutions to establish and maintain trust,and can effectively solve the problem of cross-domain authentication in a big data environment.This thesis mainly studies the following contents:1.Efficient consensus mechanism of blockchainAs a classic consensus algorithm in the alliance chain,PBFT(Practical Byzantine Fault Tolerant Algorithm)has the problems of low consensus efficiency and the inability to achieve dynamic entry and exit of nodes,which limits the application of blockchain technology in the field of cross-domain authentication.Based on the trusted computing technology,this paper proposes a multi-layer consensus model.Under the premise of ensuring the accuracy of the consensus,the consensus efficiency is improved by reducing the number of accounting nodes,and the dynamic entry and exit of nodes is achieved;through forward prevention and backward punishment guarantee The security of the system node;maintain the stability of the accounting node to reduce the system overhead caused by the replacement of the accounting node.2.Identity authentication across heterogeneous domains based on blockchain technologyAiming at the problems of excessive dependence on trusted third parties,low certificate verification efficiency,large symmetric key escrow overhead,and isolation of authentication technology between heterogeneous domains in the process of identity authentication across heterogeneous domains,a blockchain-based technology is proposed.The unified cross-domain identity authentication model adopts the three-level authentication model,and proposes the concepts of three-level trust certificates and three-level trust relationships.The trust certificates can establish trust relationships,and after the trust relationship is established,trust certificates can be generated to achieve flexible and efficient cross-domain authentication,and shielded the difference in authentication technology between heterogeneous domains by dividing the authentication stage;on the basis of a unified cross-domain identity authentication model,a cross-domain authentication protocol was proposed to solve the low efficiency of certificate authentication and symmetric key escrow problem.3.Design and implementation of medical information sharing platform based on three-level trust authentication modelData security,identity authentication and privacy protection are the problems that must be solved to realize medical infonnation sharing.Based on the proposed three-level trust identity authentication model,this paper designs and implements a medical information sharing platform,including functional modules such as hospital node joining,user registration,user identity authentication,medical information sharing,medical information query,node authentication,etc.Related data encryption and decryption operations ensure the data security,data ownership,and reliability of shared medical information of patients'medical information,and achieve efficient and reliable authentication between hospital nodes.