A privacy-preserving and efficient information sharing scheme for VANET secure communication

Traffic information sharing is the basic and kernel functionality for vehicular ad hoc network (VANET), but the issue of privacy preservation and efficiency still remains a great challenge during traffic information sharing. In this chapter, we propose a privacy-preserving and efficient traffic jam information sharing scheme named PETS, which utilizes roadside unit (RSU) as an aggregator to securely collect traffic information sent from vehicles with pseudo-identities and semantically aggregate messages to generate a traffic jam message. Then, the traffic jam message is signed by trust authority (TA) and propagated to vehicles to notify drivers, and RSU plays as a proxy to assist message verification when vehicles are busy to prevent denial-of-service (DoS) attack. The proposal achieves both privacy preservation and efficiency at the same time and significantly decreases bandwidth consumption by 10.00%~69.66% for message collection. Extensive simulation reveals that the novel scheme is feasible and has a better performance than previously suggested counterparts in terms of message loss ratio and delay.