Efficient Anonymous Batch Authentication for VANETs 🚗

Abstract—In vehicular ad hoc networks (VANETs), when a
vehicle receives a message, the certificate revocation list (CRL)
checking process will operate before certificate and signature verification.
However, large communication sources, storage space,
and checking time are needed for CRLs that cause the privacy
disclosure issue as well. To address these issues, in this paper,
we propose an efficient anonymous batch authentication scheme
(ABAH) to replace the CRL checking process by calculating the
hash message authentication code (HMAC). In our scheme, we
first divide the precinct into several domains, in which road-side
units (RSUs) manage vehicles in a localized manner. Then, we
adopt pseudonyms to achieve privacy-preserving and realize batch
authentication by using an identity-based signature (IBS). Finally,
we use HMAC to avoid the time-consuming CRL checking and
to ensure the integrity of messages that may get loss in previous
batch authentication. The security and performance analysis are
carried out to demonstrate that ABAH is more efficient in terms
of verification delay than the conventional authentication methods
employing CRLs. Meanwhile, our solution can keep conditional
privacy in VANETs.

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