The rise of vehicular ad-hoc networks (VANETs) brings promise for guaranteeing road safety and improving traffic efficiency. Nevertheless, the pity is that the problems, such as messages authentication and privacy-preserving, that come with it seriously threaten the security and stability of the VANETs. For addressing these problems, in this paper, a pairing-free certificateless signature work for VANETs that supports parallel key-insulated is constructed. On the one hand, the presented work is constructed utilizing the elliptic curve rather than the costly pairing operation. In this way, each vehicle can generate or verify authentication message in a low energy consumption manner. On the other hand, the mechanism of parallel key-insulated is introduced in our proposed work where two helpers alternately assist the users for the periodical key updates, which can not only resist the key exposure but also reduce the risk of the helper’s secret key exposure. Considering possible key exposure in the high dynamic VANETs scenarios, our scheme is more stable and feasible for VANETs environments compared with the existing works. Finally, our work is proved to be strongly key-insulated secure under the discrete logarithm assumption in the random oracle model. Meanwhile, the detailed performance comparisons demonstrate that our work is energy efficient and practical for VANET.

车载自组织网络 (VANET) 的兴起为保障道路安全和提高交通效率带来了希望。但遗憾的是，随之而来的消息认证、隐私保护等问题严重威胁到VANETs的安全性和稳定性。针对这些问题，本文构建了一种支持并行密钥隔离的 VANET 无配对无证书签名工作。一方面，所提出的工作是利用椭圆曲线而不是昂贵的配对操作构建的。这样，每个车辆都可以以低能耗的方式生成或验证认证消息。另一方面，在我们提出的工作中引入了并行密钥隔离机制，其中两个助手交替辅助用户进行定期密钥更新，不仅可以抵抗密钥暴露，还可以降低助手秘密密钥暴露的风险。考虑到在高动态 VANETs 场景中可能存在的关键暴露，与现有工作相比，我们的方案对于 VANETs 环境更加稳定和可行。最后，我们的工作在随机预言机模型中的离散对数假设下被证明是强密钥绝缘安全的。同时，详细的性能比较表明，我们的工作对 VANET 来说是节能且实用的。与现有工作相比，我们的方案对于 VANETs 环境更加稳定和可行。最后，我们的工作在随机预言机模型中的离散对数假设下被证明是强密钥绝缘安全的。同时，详细的性能比较表明，我们的工作对 VANET 来说是节能且实用的。与现有工作相比，我们的方案对于 VANETs 环境更加稳定和可行。最后，我们的工作在随机预言机模型中的离散对数假设下被证明是强密钥绝缘安全的。同时，详细的性能比较表明，我们的工作对 VANET 来说是节能且实用的。