The utilized authentication framework in a transportation network definitely influences the network size (number of vehicles) and vehicles' anonymity degree. Some frameworks can accommodate larger network size trading off anonymity level; other authentications offer superior anonymity traits given sparse networks only. Addressing such knowledge gap, we introduce a context-aware authentication interchanging scheme. Every specific time interval, each networked vehicle checks its context. For a crowded neighborhood, the vehicle utilizes a low-communication-overhead authentication, while for a sparse neighborhood, the vehicle alters to more anonymous authentication. The frameworks of interest are the Public Key Infrastructure (PKI) authentication, the Group Signature (GS) authentication, and a newly developed Identity-Based Cryptographic (IBC) framework. The scheme's proof of concept is validated by a formed argument applying the strategies of attacker games and forking lemmas. The scheme's effectiveness is analyzed for two communication scenarios; the results show that by alternating authentications, better performance is achieved in comparison to the state of having single secure authentication throughout the network lifetime. The approach is computably fast and does not compromise the autos' anonymity.

运输网络中使用的身份验证框架肯定会影响网络规模（车辆数量）和车辆的匿名程度。某些框架可以容纳较大的网络规模，但要顾及匿名级别。仅在网络稀疏的情况下，其他身份验证才能提供出色的匿名性。针对这种知识差距，我们介绍了一种上下文感知的身份验证交换方案。在每个特定的时间间隔，每个联网的车辆都会检查其上下文。对于拥挤的邻居，车辆使用低通信开销的身份验证，而对于稀疏的邻居，车辆将更改为更多匿名身份验证。感兴趣的框架是公钥基础结构（PKI）身份验证，组签名（GS）身份验证，以及新开发的基于身份的密码（IBC）框架。该方案的概念证明是通过应用攻击游戏和分叉引理的策略形成的论证来验证的。针对两种通信场景分析了该方案的有效性；结果表明，与在整个网络生命周期中具有单一安全身份验证的状态相比，通过交替身份验证可以获得更好的性能。该方法可算是快速的，并且不会损害汽车的匿名性。与在整个网络生命周期中具有单一安全身份验证的状态相比，可以获得更好的性能。该方法可算是快速的，并且不会损害汽车的匿名性。与在整个网络生命周期中具有单一安全身份验证的状态相比，可以获得更好的性能。这种方法可算是快速的，并且不会损害汽车的匿名性。