Efficient Noninteractive Secure Protocol Enforcing Privacy in Vehicle-to-Roadside Communication Networks

Vehicular ad hoc networks (VANETs) have attracted extensive attentions in recent years for their promises in improving safety and enabling other value-added services. In this paper, we propose an efficient noninteractive secure protocol preserving the privacy of drivers in vehicle-to-roadside (V2R) communication networks with the ability of tracing malicious drivers only by a third trusted party (TTP), who is assumed to be fully trusted. Our proposed protocol can provide these complex requirements depending on symmetric cryptographic algorithms. The drivers can change the symmetric key used for message encryption with each message transmission and find noninteractively new values to be correctly used for verification and tracing in case of malicious behavior. The advantages of symmetric cryptographic algorithms over asymmetric algorithms are the faster processing speed and the shorter message length which makes it suitable for real-time applications such as V2R communications. An efficient key revocation scheme will be also described.