中文摘要：

提出一种新型高效的基于身份的消息认证方案，该方案采用椭圆曲线密码构建了轻量级的安全认证协议，无需双线性对运算，降低了签名与认证过程的运算复杂性，同时提供了条件隐私保护的功能，安全分析验证了该方案可以满足VANET的安全需求。性能分析表明，与最近的相关方案相比，该方案不仅减少了签名与验证的计算开销，同时也降低了通信开销。

英文摘要：

A new efficient identity-based message authentication scheme for VANET was proposed. The proposed scheme decreased the complexity of cryptographic operations on signature by using elliptic curve cryptosystem （ECC） to construct authentication protocol without bilinear pairing and provided the function of conditional privacy-preserving. Security analysis demonstrated that the proposed scheme satisfies all security and privacy requirements for VANET. Per- formance analysis show that compared with the most recent proposed schemes the proposed scheme decreases the computation cost and communication cost.