关键词: 关键词: 车联网, 安全认证, 跨信任域, 隐私保护, 动态累加器

Abstract: Abstract: To address the issues in cross-domain authentication for the VANETs, including the inability to distinguish vehicle types, excessive overhead caused by repeated authentication, and insufficient security, a Cross-domain Handover Authentication Scheme with Vehicle Type Verification (CHAS-VTV) is proposed. CHAS-VTV employs certificateless public key cryptography to eliminate key escrow and certificate management problems while improving cross-domain authentication efficiency. A dynamic accumulator is utilized to store and verify vehicle types, which enables classified cross-domain identity authentication. Considering the complete process of cross-domain vehicle movement, Hash-based Message Authentication Code (HMAC) is adopted to achieve efficient handover authentication between vehicles and multiple RSUs. Security analysis demonstrates that CHAS-VTV resists various malicious attacks, including public key replacement attack, private key leakage attack, and forgery attack. Performance evaluations indicate that compared to existing cross-domain handover authentication schemes, CHAS-VTV reduces computational overhead by over 78.81% and 77.76% in the cross-domain authentication and handover authentication phases while lowering communication overhead by more than 65.29% and 30.08%.

Key words: Keywords: VANETs, Cross-domain, Authentication, Privacy Protection, Dynamic Accumulator