Vehicular Ad hoc Network (VANET) is a versatile and ad hoc network,
where the vehicles must be authenticated before sharing any critical
information. During authentication, privacy of the users must be
preserved. There are several surveys on privacy-preserving
authentication schemes in VANET. However, none of them are focused on
the ability of the schemes to address different security issues and
their robustness against security attacks. In this paper, we present a
review on various privacy-preserving authentication schemes in VANET.
These schemes may be categorized into several types like
symmetric/asymmetric key cryptography based schemes, digital signature
based schemes, ID cryptography based schemes, pseudonym based schemes,
homomorphic encryption based schemes and blockchain based schemes. A
comprehensive study of the prominent schemes, with regards to their
effectiveness in addressing different security issues and their
robustness against possible attacks, has been performed. Open issues and
scope for future work are also highlighted.
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