By regularly broadcasting information about the road and weather conditions around vehicles, a Vehicular Adhoc Network (VANET) is expected to improve traffic congestion and relieve traffic pressure. To guarantee the safe communication of vehicles, the security and privacy problems are urgent to be solved in VANETs. Until now, numerous conditional privacy-preserving authentication (CPPA) schemes have been proposed to solve these problems. However, cross-region authentication still not being taken seriously in CPPA scheme. Although several blockchain-based CPPA scheme have being proposed to realize cross-region authentication, there still exist some imperfection such as frequent interactions or unlinkability. Therefore, this paper proposes a novel blockchain-assisted authentication scheme to solve these existing issues. First, we adopt a puncturable pseudorandom function to complete identity authentication of vehicles. Second, a key derivation algorithm is used to achieve unlinkability of messages. Third, we achieve cross-region authentication by taking advantage of the properties of blockchain. The security analysis shows that the proposed scheme is suitable for VANETs.
BACPPA: An Effective Blockchain-Assisted Conditional Privacy-Preserving Authentication Scheme for Vehicular Ad Hoc Networks
2021-09-01
663786 byte
Conference paper
Electronic Resource
English