Industrial wireless networks (IWNs) have applications in areas such as critical infrastructure sectors and manufacturing industries such as car manufacturing. In car manufacturing, IWNs can facilitate manufacturers to improve the design of the vehicles by collecting vehicular status and other related data (such an IWN is also known as vehicular ad hoc networks-VANETs). Vehicle positioning is a key functionality in VANETs. Most existing vehicle positioning systems are capable of providing accurate 2D positioning, but the demand for accurate 3D positioning has increased sharply in recent times (e.g., due to the building of more elevated roads). There are, however, security and privacy concerns relating to 3D positioning systems in VANET. In this paper, we propose two secure and privacy-preserving 3D positioning schemes based on vehicle-to-roadside (V2R) and vehicle-to-vehicle (V2V) communications, respectively. Our schemes are based on the round trip time ranging technique which is used to achieve 3D position. The security and the privacy of vehicles in our schemes are guaranteed through a newly designed one-pass authenticated key agreement protocol. Using experiments, we show that a vehicle can determine whether it is on or under an elevated road in a short period of time.

The increasing popularity of smart vehicles and vehicular ad hoc networks (VANETs) has reinforced the importance of Internet connectivity. However, existing solutions (e.g., those based on cooperative downloading via drive-thru Internet) have a number of limitations, partly due to the challenges in selecting reliable proxy vehicles in a fast moving driving situation, and balancing between flexible data downloading and achieving strong security. Therefore, in this paper we propose a secure, robust and flexible cooperative downloading scheme based on our reputation based selection mechanism and ordered signatures. Using the reputation based selection mechanism, only vehicles with the highest expected downloading capacities will be selected as proxy vehicles. This helps us to avoid selecting less reliable proxy vehicles. The flexible data downloading is achieved by dividing a file into small blocks so that a proxy vehicle can flexibly vary the file / data download, for example based on existing condition. Our scheme also achieves strong security, in the sense that it realizes traditional authentication, privacy preservation and message confidentiality, as well as a newly introduced security requirement (i.e., process authentication: authenticates the order of file blocks and the order of the assisting vehicles using ordered signatures).

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