A cluster based secure architecture for vehicular ad hoc networks

In this paper, we propose a dynamic PKI for vehicular ad hoc networks aiming to distribute the role of the central certification authority (CA) among a set of dynamic chosen CAs. The election of dynamic CAs is based on a clustering algorithm where the cluster heads (CH) perform the role of CAs. The clustering process is based on both security and mobility. Furthermore, we define a new approach called the dynamic demilitarized zone (DDMZ) formed by confident nodes located at 1-hop from the CH of the same cluster and intended to perform the registration authorities (RA). Extensive simulations are conducted to evaluate the performance of our clustering algorithm and to investigate the impact of transmission range, speed of vehicles and inter vehicles distances on the stability of the security infrastructure.