中文摘要：

车联网是一种ad hoc网络,因此易受到欺骗攻击。可信硬件可以防止欺骗攻击,然而使用可信硬件普遍要求系统层面的支持,对系统进行改造的开销限制了可信硬件的实用性。本文针对车联网的特性,提出了一种最小化的、外接式的可信硬件设计方案,可以在不改变原有系统硬件的前提下保证通信协议安全,并基于最小化的可信硬件设计提出了一种车联网中紧急安全信息中继的协议。

英文摘要：

VANET is an ad hoc network vulnerable to Byzantine faults. Some trusted hardware could prevent the spoofing attack, and however the trusted hardware would generally require system-level support, and the cost to make the system compatible to trusted hardware usually hinders its practicability. Considering the unique characteristics of VANET, a novel type of minimal, externally-attached trusted hardware is suggested which could protect the security of communication protocols without any change of original system hardware- Trusted Counter Add-on. Based on this minimal trusted hardware, an improved security protocol for relaying of emergency warning message in VANET is proposed.