With the rising popularity of the Internet and communication technology, vehicles can analyze and judge the real-time data collected by various cloud service providers (CSPs) in a vehicular network. However, in a vehicular network environment, real-time data are transmitted via wireless channels, which can lead to security and privacy issues. To avoid illegal access by adversaries, vehicle authentication and key agreement mechanism has been considered as one of the promising security measures in vehicular network environments. Besides, most of the solutions focus on authentication between one vehicle and one CSP. In such strategies, the implementation of efficient authentication for multiple vehicles and CSPs simultaneously is usually challenging. Further, they are also subjected to performance limitations due to the overhead incurred. To solve these issues, we propose a many-to-many authentication and key agreement scheme for secure authentication between multiple vehicles and CSPs. The proposed scheme can prevent unauthorized access and provide SK-security even if temporary information is leaked. To improve the service, the CSP only needs to broadcast an anonymous message periodically instead of having to generate a unique anonymous message for each of vehicles. Similarly, when a vehicle wants to request the services of $m$ CSPs, it only needs to send one request message instead of $m$ . Therefore, the proposed scheme not only implements many-to-many communication but also significantly reduces the computation and communication overhead. Moreover, a thorough security analysis shows that the proposed scheme provides better security compared to other related schemes.

中文翻译：

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SMAKA：车载网络的安全多对多身份验证和密钥协商方案

随着Internet和通信技术的日益普及，车辆可以分析和判断由车载网络中的各种云服务提供商（CSP）收集的实时数据。但是，在车载网络环境中，实时数据是通过无线通道传输的，这可能导致安全性和隐私问题。为了避免对手的非法访问，在车辆网络环境中，车辆认证和密钥协商机制已被视为有希望的安全措施之一。此外，大多数解决方案都集中在一辆车和一辆CSP之间的身份验证上。在这样的策略中，同时实现多个车辆和CSP的有效身份验证通常具有挑战性。此外，由于产生的开销，它们也受到性能限制。为了解决这些问题，我们提出了多对多身份验证和密钥协商方案，用于在多个车辆和CSP之间进行安全身份验证。所提议的方案可以防止未经授权的访问并提供SK安全性，即使临时信息泄漏了。为了改善服务，CSP仅需要定期广播匿名消息，而不必为每辆车生成唯一的匿名消息。同样，当车辆想要请求以下服务时 CSP只需要定期广播匿名消息，而不必为每个车辆生成唯一的匿名消息。同样，当车辆想要请求以下服务时 CSP只需要定期广播匿名消息，而不必为每个车辆生成唯一的匿名消息。同样，当车辆想要请求以下服务时 $ m $ CSP，只需要发送一条请求消息即可 $ m $ 。因此，提出的方案不仅实现了多对多通信，而且显着减少了计算和通信开销。此外，彻底的安全性分析表明，与其他相关方案相比，该方案提供了更好的安全性。