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Social-aware data diffusion can improve the dissemination performance in Vehicular Ad hoc NETworks (VANETs). However, if some vehicles lie their social claims and vehicle location information is not protected, social-aware data diffusion may not work well. In this paper, to tackle the security and privacy challenges existing in social-aware data diffusion, the authors propose an Efficient Vehicle Social Evaluation (EVSE) scheme, which enables each vehicle to show its authentic social evaluation to others while without disclosing its past location information. As a result, it can meet the prerequisites for the success of social-aware data diffusion in VANETs.
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