Mitigating Blackhole attacks in a hybrid VDTN

In the past we presented a delay tolerant network that used public buses and trams in the city of Braunschweig to monitor air pollution. Today, as smartphones are becoming computationally more powerful and offer a variety of communication interfaces, it becomes attractive to investigate whether smartphones and vehicular nodes can cooperate with each other, forming a network that can provide better quality of service to applications. In this paper, we evaluate the feasibility of creating an integrated Delay- and Disruption-Tolerant Network (DTN) consisting of smartphones and the public transportation system. Most importantly we propose a Misbehavior Detection System (MDS) to protect the security of the hybrid network. The evaluation results show that our MDS is able to efficiently detect attackers and defend the hybrid network against the interference of malicious nodes.