Abstract: Certificate revocation is one of the important problems to provide the security of vehicular Ad Hoc networks, but traditional CRL distribution schemes are not suitable due to large dimension, high mobility and other related reasons. In this paper, based on consideration of node mobility patterns, speed and other characteristics, a CRL degradation scheme is firstly proposed, then a speed oriented fast certificate revocation scheme is introduced. Performance analysis shows the proposed scheme is better than traditional one when using short-lived certificates.

Key words: vehicular Ad Hoc networks, certificate revocation list, speed, valid period of certificates

摘要： 证书撤销是保障车载Ad Hoc网络安全的难点问题之一，但传统的CRL发布方式由于网络规模大，车辆机动性强等原因并不适用。结合车载Ad Hoc网络中节点移动规律和速度等特性，在提出降解CRL规模的方法的基础上，进一步提出一种基于车辆速度证书快速撤销方案。分析表明在证书有效期较短的情况下，该方案要优于传统方案。

关键词: 车载Ad Hoc网络, 书撤销列表, 车辆速度, 证书有效期