Trust-Chain-Based Certificate Revocation Control in Autonomous Vehicle Networks

One of the biggest problems in V2X communication is the inclusion of faulty or illegal nodes in the network. In V2X systems using PKI, the primary approach is to revoke the certificates of malicious and compromised vehicles and add them to a CRL. The issue of CRL distribution from the central server without high latency and high traffic is a subject of research. In this paper, a semi-distributed certificate revocation control system called trust-chain is proposed, which reduces the demand for CRL servers. In the simulation results, the number of requests to the central CRL server is reduced by 35% on average using the proposed semi-distributed structure. Additionally, in cases where vehicles cannot communicate with the RSU or central server, vehicles can communicate securely owing to the semi-distributed framework of the proposed system.