Dynamic anonymous identity authentication (DAIA) scheme for VANET.

Summary: With the development of the vehicular ad hoc network, the security and privacy are now becoming vital concerns, especially when the attacker owns more and more resources. In order to address these concerns, a dynamic anonymous identity authentication scheme is proposed using Elliptic Curve Discrete Logarithm Problem and blockchain method, which guarantees the security and fast off‐line authentication for vehicle‐to‐infrastructure. Specifically, a dynamic pseudonym key is generated using tamper proof device (TPD) for off‐line authentication and anonymity when a vehicle roams among different roadside units' (RSUs) communication ranges. Even if all RSUs are compromised, vehicle's identity is still privacy. Moreover, two additional design goals are more suitable for the practical environment: (1) the reduced assumption of TPD; (2) certification authority can trace vehicle under the authorization by law. A dynamic anonymous identity authentication scheme is proposed for vehicular ad hoc network, which is more suitable for the practical situation. The analysis and the simulation show that the proposed scheme not only guarantees the offline update, traceable pseudonyms, and anonymous identity authentication, but also improves the efficiency for key pairs dynamically changement. [ABSTRACT FROM AUTHOR]