A V2X Access Authorization Mechanism based on Decentralized ID (DID) and Verifiable Credentials (VC)

In this paper, we propose DID/VC-based V2X Access Authorization Mechanism that improves the CA-centered structure problem of the V2X security authentication system developed to ensure the anonymity of V2X users and create a safe operating basis for ITS. The CA-centered PKI structure represents a structure in which there is a CA that can lead or control the identity of the identity subject. In this structure, the identity subject's personal information and certificate can be stolen by a Misbehavior CA, and there is a risk of external attack such as MITM attack. Building trust in V2X networks is a major problem because it is difficult to evaluate reliability between vehicles and infrastructure in an untrustworthy environment. In this paper, we propose a DID/VC-based V2X Access Authorization Mechanism that selects a trusted authority to improve reliability, guarantees data sovereignty and privacy protection of identity subjects, and generates safe digital credentials.