Research On Identification Technology For Blockchain

Identification technology is an effective solution to confirm the legitimacy of the operator's identity in cyberspace.It can ensure that the binding relationship between the entity and his/her digital identity.Identification,as the first barrier of cyberspace security,plays an important role in cyberspace governance system.In traditional identification schemes based on public key cryptography,there is a trusted third party to complete the process of identification,such as key generation center,certificate authority and so on.There are security risks in the centralized identification schemes,including untrustworthy institutions,single point of failure,data leakage and so on.Blockchain technology provides a new solution for identification.In essence,blockchain is a distributed data storage technology,which has the characteristic of decentralization,consensus trust,immutability and traceability.It can effectively solve the problems of data centralization,data tampering and single point of failure in existing traditional identification schemes.However,it still needs the trusted third party.There is no decentralized identification mechanism.Therefore,it is of great theoretical significance and practical value to study the distributed identification mechanism to meet the requirements of decentralized application scenarios.Aiming at the above problems,this thesis proposed two identification schemes focusing on the decentralized identification mechanism and personal private protection.The main research contents are as follows.1.This thesis proposes a multi-authority identity-based identification scheme.The proposed scheme mainly combines with the distributed key generation technology to generate users' private keys without trusted third party.Moreover,the security of the proposed scheme is analyzed,and the conclusion shows that the proposed scheme is secure against impersonation under passive and concurrent attacks in the random oracle model.2.This thesis proposes a multi-authority attribute-based identification scheme.The proposed scheme mainly combines the distributed key generation technology with attribute-based cryptography,and realizes identification by checking whether the number of intersection of the user attribute set and the verification policy attribute set satisfies the preset threshold value.At the same time,it resolves the problem of excessive disclosure of personal privacy information.Finally,the security of the proposed scheme is analyzed,and the conclusion shows that the proposed scheme is non-counterfeit and anonymity.