In the vehicular ad hoc network, moving vehicles can keep communicating with each other by entering or leaving the network at any time to establish a new connection. However, since many users transmit a substantial number of messages, it may cause reception delays and affect the entire system. A certificateless aggregate signature scheme can provide a signature compression that keeps the verification cost low. Therefore, it is beneficial for environments constrained by time, bandwidth, and storage, such as vehicular ad hoc network. In recent years, several certificateless aggregate signature schemes have been proposed. Unfortunately, some of them still have some security and privacy issues under specific existing attacks. This article offers an authentication scheme that can improve security, privacy, and efficiency. First, we apply the certificateless aggregate signature method to prevent the onboard unit devices from leaking sensitive information when sending messages. The scheme is proven to be secure against the Type-1 (A1)$({\mathcal{A}}_1)$ and Type-2 (A2)$({\mathcal{A}}_2)$ adversaries in the random oracle model under the computational Diffie–Hellman problem assumption. Then, the performance evaluation demonstrates that our proposed scheme is more suitable for deployment in vehicular ad hoc network environments.

在车载自组网中，移动的车辆可以随时进入或离开网络，建立新的连接，从而保持相互通信。然而，由于许多用户发送大量消息，可能会导致接收延迟并影响整个系统。无证书聚合签名方案可以提供保持验证成本低的签名压缩。因此，它有利于受时间、带宽和存储限制的环境，例如车载自组织网络。近年来，已经提出了几种无证书聚合签名方案。不幸的是，其中一些在特定的现有攻击下仍然存在一些安全和隐私问题。本文提供了一种可以提高安全性、隐私性和效率的身份验证方案。第一的，我们采用无证书聚合签名方法，防止车载单元设备在发送消息时泄露敏感信息。该方案被证明对 Type-1 是安全的（一1）$({\mathcal{A}}_1)$和 Type-2 ( A 2 )$({\mathcal{A}}_2)$在计算 Diffie-Hellman 问题假设下的随机预言模型中的对手。然后，性能评估表明我们提出的方案更适合部署在车载自组织网络环境中。