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Vehicular Ad hoc NETworks (VANETs) are envisioned to provide promising applications and services. One critical deployment issue in VANETs is to motivate vehicles and their drivers to cooperate and contribute to packet forwarding in vehicle-to-vehicle or vehicle-to-roadside communication. This paper examines this problem, analyze the drawbacks of two straightforward schemes, and present a secure incentive scheme to stimulate cooperation in VANETs.
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