A Distributed Key Management Framework With Cooperative Message Authentication in VANETs
In this paper, the authors propose a distributed key management framework based on group signature to provision privacy in Vehicular Ad hoc NETworks (VANETs). Distributed key management is expected to facilitate the revocation of malicious vehicles, maintenance of the system, and heterogeneous security policies, compared with the centralized key management assumed by the existing group signature schemes. In their framework, each Road Side Unit (RSU) acts as the key distributor for the group, where a new issue incurred is that the semi-trust RSUs may be compromised. Thus, they develop security protocols for the scheme which are able to detect compromised RSUs and their colluding malicious vehicles.