Identity-Based Cross-Domain Authentication by Blockchain via PKI Environment

To tackle the difficulty of immediate identity revocation in the identity-based cryptography (IBC) authentication system, this paper proposes an identity signature scheme by security mediator (MED), which can revoke entity. Besides, aiming at cross IBC domains authentication under large-scale network architecture, an efficient identity-based cross-domain authentication protocol via public key infrastructure (PKI) environment is presented, combining blockchain. It reduces effectively complexity by consortium blockchain, thus more available for authentication in large-scale network. Through security and performance analysis, the evaluation results show the proposed scheme introduces lower overhead in computation and communication by blockchain, with resisting various attacks and excellent security in the process of authentication, compared with other authentication protocols.