Ensuring secure and efficient message authentication in vehicular ad hoc networks (VANETs) is a significant challenge, particularly in the face of insider threats and high mobility. This paper proposes a trust-driven batch authentication scheme, dynamically optimized through real-time trust updates. We introduce a lightweight certificateless elliptic curve cryptography (CL-ECC) protocol for efficient batch verification, combined with a blockchain-based dynamic trust evaluation model that incorporates a Gompertz-based trust update function and an enhanced proof-of-work (PoW) algorithm for decentralized trust management. To ensure tamper-resilience and decentralization, Practical Byzantine Fault Tolerance (PBFT) consensus is employed. Security analysis demonstrates that the proposed scheme effectively defends against forgery, message tampering, replay attacks, and internal threats such as on-off and collusion attacks. Experimental results show that our scheme reduces computational overhead by 7.9-56.9% and improves average message utilization by 114.2-198.3% compared to conventional schemes under various scenarios. These results demonstrate that the proposed scheme is secure, efficient, and well-suited for highly mobile and trust-sensitive VANET environments.
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