Abstract
In a vehicular ad hoc network (VANET), a road-side infrastructure or road-side unit (RSU) is anticipated to be installed at some road-side location. This exposes the VANET to several different adversaries. In this paper, we present an authentication scheme for infrastructure-generated safety messages using an identity (ID)-based proxy signature and verification mechanism. An ID-based technique offers a certificate-less public key verification, while a proxy signature provides flexibility in message authentication and trust management. We incorporate an ID-based proxy signature framework with the standard elliptic curve digital signature algorithm for safety application messages from RSU. We also provide forwarding of safety message components ensuring the accountable authentication of RSU's application messages. Security analysis and network simulation prove that our scheme is resilient to all major security threats, compatible to standards and efficient in terms of computation complexity. We also conduct simulation experiments to determine the most suitable access classes for on-board unit and RSU.
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