Abstract-Vehicular ad hoc networks (VANETs) allow wireless communications between vehicles without the aid of a central server. Reliable exchanges of information about road and traffic conditions allow a safer and more comfortable travelling environment. However, such profusion of information may allow unscrupulous parties to violate user privacy. On the other hand, a degree of auditability is desired for law enforcement and maintenance purposes. In this paper we propose a Threshold Anonymous Announcement service using direct anonymous attestation and one-time anonymous authentication to simultaneously achieve the seemingly contradictory goals of reliability, privacy and auditability.

Abstract-An announcement scheme is a system that facilitates vehicles to broadcast road-related information in vehicular ad hoc networks (VANETs) in order to improve road safety and efficiency. In this paper, we propose a privacy-aware reputationbased announcement scheme that provides message reliability evaluation, auditability, and robustness.

Vehicular ad hoc networks provide a safer driving environment by allowing vehicles to broadcast safety related messages and inform neighbouring vehicles regarding traffic and road conditions. Safety can only be achieved if transmission of messages is reliable. However, verification of reliability may violate privacy. On the other hand, it is desirable that malicious or defective vehicles can be identified and revoked. In this paper, we propose a new protocol by using certificateless signature and reputation system to achieve the sometimes contradictory requirements of a reliable, private and accountable vehicular ad hoc network message announcement scheme. Copyright © 2013 John Wiley & Sons, Ltd.

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Abstract-Vehicular ad hoc networks (VANETs) allow vehicles to generate and broadcast messages to inform nearby vehicles about road conditions, such as traffic congestion and accidents. Neighboring vehicles can utilize this information, which may improve road safety and traffic efficiency. However, messages generated by vehicles may not be reliable. We propose a novel announcement scheme for VANETs based on a reputation system that allows evaluation of message reliability. We present a secure and efficient scheme that is robust and fault tolerant against temporary unavailability of the central server.