IMPROVEMENT ON A CONDITIONAL PRIVACY-PRESERVING AUTHENTICATION SCHEME FOR VANET

Abstract

Based on the roadside unit (RSUB) and tamper proof devices (TPDB) technology, Poursnaghi and Zahednejad proposed a conditional privacy-preserving authentication scheme for intelligent transportation. Through analysis, we found that their scheme can’t effectively achieve conditional tracking, and there are loopholes in the tracking identity phase, which makes the scheme vulnerable to internal attacks. At the same time, due to the lack of randomness of the signature of the message, the scheme is vulnerable to spoofing attacks. In order to overcome the shortcomings of the Poursnaghi et al. scheme, an improved scheme is presented. The improvement scheme improves the way of providing the identity information of the onboard unit (OBU) in the original scheme and the signature of the message, so that the trusted authority (TA) can obtain the identity information of the onboard unit (OBU) through calculation, thereby verifying Whether the two sides of the communication are credible, effectively avoiding internal attacks, and improving the randomness of the signature of the message, effectively avoiding the counterfeit attack and improving the security of the solution.