Abstract

In this paper, we propose a secure cooperative data downloading framework for paid services in vehicular ad hoc networks (VANETs). In our framework, vehicles download data when they pass by a road side unit (RSU) and then share the data after they travel out of the RSU’s coverage. This paper introduces geographical QoS routing information capable of providing optimal paths between the source and all destinations that fulfill certain QoS requirements for packet forwarding. Coordinated sharing can avoid collisions in the medium access control (MAC) layer and the hidden terminal issue in multi-hop transmissions. A salient feature of the proposed sharing protocol is that it can guarantee the receipt of the requested data file for each applicant vehicle passing a road side unit. we also address security and privacy issues in the process of data downloading and sharing, ensuring applicants’ exclusive access to the applied data and privacy of the vehicles involved in the application.

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