Vehicular Communication (VC) systems will greatly enhance intelligenttransportation systems. But their security and the protection of their users'privacy are a prerequisite for deployment. Efforts in industry and academiabrought forth a multitude of diverse proposals. These have now converged to acommon view, notably on the design of a security infrastructure, a VehicularPublic Key Infrastructure (VPKI) that shall enable secure conditionallyanonymous VC. Standardization efforts and industry readiness to adopt thisapproach hint to its maturity. However, there are several open questionsremaining, and it is paramount to have conclusive answers before deployment. Inthis article, we distill and critically survey the state of the art foridentity and credential management in VC systems, and we sketch a roadmap foraddressing a set of critical remaining security and privacy challenges.
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