New threshold anonymous authentication for VANETs

This paper proposes a new threshold anonymous authentication protocol to support secure and user privacy-preserving communication in vehicular ad hoc networks (VANETs). The proposed protocol holds the following properties: (a) it allows vehicles to broadcast messages with an authenticated while anonymous way; (b) it allows vehicles to accept the received broadcasted messages from others according to their own policies; (c) it allows the trusted third party to reveal the identity information of the vehicle who broadcasted a false message before with constant cost. Due to the above properties, our proposal helps improve the security and performance as compared to the existing authentication protocols for VANETs.