Research On Supervised Anonymous Identity Authentication Tecnology Based On Blockchain

With the increasing complexity of the network environment,the traditional authentication technology has also exposed some drawbacks.For example,the traditional Public Key Infrastructure(PKI)system relies excessively on the certificate authority,leading to too much centralized power and prone to single point of failure,personal information leakage,complex trust paths and other problems.At the same time,the continuous development of information technology also puts forward higher requirements for authentication technology,for example,to realize authentication anonymization while ensuring authentication efficiency.However,most of the current literature on anonymous identity authentication does not consider regulatory issues,and it is difficult to hold dishonest users accountable.As an emerging technology,blockchain provide some solutions to the above problems and inject new vitality into the field of identity authentication by virtue of a distributed decentralized trust system.However,there are still some contradictions between blockchain technology and identity authentication technology,for example,the excessive transparency of blockchain ledger runs counter to the anonymization requirement of identity authentication.Therefore,the following research work is accomplished in this thesis.(1)To address the problems of anonymous identity authentication,a scheme called Blockchain-based Supervised Anonymous Public Key Infrastructure(BSA-PKI)was proposed in this thesis.The scheme optimizes the traditional X.509 digital certificate structure and designs an anonymous certificate for presentation at authentication process.The blockchain certificate lifecycle management mechanism was investigated to meet the requirements of BSA-PKI.In order to achieve the anonymization requirement for authentication,BSA-PKI selects a suitable zero-knowledge proof protocol for certificate verification and designs a more reasonable blockchain storage structure.Through experimental analysis,it is proved that the scheme has higher security.(2)To address the heterogeneous cross-domain authentication problem between certificate based public key infrastructure system and Identity-based Encryption(IBE),a sheme called Blockchain-based Supervised Anonymous Cross-domain Authentication Scheme(BSA-CAS)was proposed in this thesis.The sheme preserves the original infrastructure of two trust domains and establishes a network of user trust relationships in the blockchain system,simplifying the trust model in heterogeneous cross-domain authentication.BSA-CAS uses group signature to design anonymous supervisory properties.Through system analysis,it was demonstrated that BSA-CAS possesses better security and at the same time obtains a good balance between security and authentication efficiency.(3)To demonstrate the effectiveness of BSA-PKI,a system called Blockchain-baesd Anonymous Crowd-sourcing System(BACS)was proposed in this thesis.Since users of crowdsourcing systems have higher requirements for personal information protection and data security,the system achieves decentralization,anonymity,and supervisability of the system based on BSA-PKI.In the system analysis,it is proved that the system has authentication reliability and the system performance meets the users' requirements,which has practical significance and application value.