A Policy Enforcement Framework for Secure Data Dissemination in Vehicular Ad Hoc Network

In vehicular ad hoc networks (VANETs), enforcing expressive and suitable access policy is of great importance to achieve desirable and accurate data dissemination services. Recently, secure data dissemination schemes based on attribute-based encryption in VANETs have received considerable attention for their ability of fine-grained access control. Therefore, how to enforce accurate access policy in dynamic VANETs becomes significant yet very challenging. In order to achieve timely, flexible, and accurate data dissemination, we propose a policy enforcement framework for secure data dissemination, which enables data-sender vehicles with high mobility and RSUs with broad perception ability to co-design access control policy. Also, we design a policy combination method, which enforces an expressive access control policy based on the disjunctive norm form (DNF) formed by different attributes. Then we propose a policy conflict resolution based on confidence weights to deal with conflict policies. Finally, the experimental results demonstrate that our proposed scheme is applicable and efficient for secure data dissemination in VANETs.