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Data privacy in Vehicular Ad hoc NETworks(VANET) is a practical issue currently under the research and development. Privacy preserving anonymity authentication in network is a challenging topic combining anonymity, authentication, data privacy and network. Existing anonymity authentication in VANET are based on k-anonymity model, but K-anonymity model group selection may leak information due to absence of diversity in the sensitive attribute etc., and thus group selection is a problem left unresolved.
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