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.
ACKNOWLEDGMENT This research was supported in part by the MSIT(Ministry of Science and ICT), Korea, under the ITRC(Information Technology Research Center) support program(IITP-2021-0-01835) supervised by the IITP(Institute for Information Communications Technology Planning Evaluation) and the MSIT(Ministry of Science and ICT), Korea, under the ITRC(Information Technology Research Center) support program(IITP-2022-2018-0-01396) supervised by the IITP(Institute for Information Communications Technology Planning Evaluation). Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (P0008703, The Competency Development Program for Industry Specialist) and supported by Institute of Information communications Technology Planning Evaluation (IITP) grant funded by the Korea government(MSIT) (2021-0-00590, Decentralized High Performance Consensus for Large-Scale Blockchains)
