The use of vehicle-to-everything (V2X) communication is expected to significantly improve road safety and traffic management. We present an efficient protocol, called the AEE protocol, for protecting data authenticity and user privacy in V2X applications. Our protocol provides event-based likability, which enables messages from a subject vehicle to be linked to a specific event in order to prevent Sybil attacks. Messages on different events are unlinkable to preserve the long-term privacy of vehicles. Moreover, our protocol introduces a new method for generating temporary public keys to reduce computing and transmission overheads. Such a temporary public key is bound with a certain event and is automatically revoked when the event is over. We describe how to apply our protocol in vehicular communications using two exemplar use cases. To further reduce the real-time computational complexity, our protocol enables us to decompose the cryptographic operations into offline processes for complex operations and real-time processes for fast computations.

翻译：车辆到一切（V2X）通信有望显著提升道路安全与交通管理水平。本文提出一种名为AEE的高效协议，用于保护V2X应用中数据的真实性与用户隐私。该协议提供基于事件的可链接性，使目标车辆的消息可关联至特定事件以抵御女巫攻击；而不同事件间的消息则不可链接，从而保障车辆的长期隐私。此外，本协议引入了一种临时公钥生成新方法，旨在降低计算与传输开销。此类临时公钥与特定事件绑定，并在事件结束后自动撤销。我们通过两个示例用例描述了如何在车辆通信中应用该协议。为进一步降低实时计算复杂度，本协议将密码学操作分解为离线预处理（复杂运算）与实时快速计算两个阶段。