Abstract
Denial-of-Service (DoS) attacks are serious threat due to the resources constrained property in wireless sensor network (WSN). Among these attacks the energy-consumption DoS attacks cause the most damages to the wireless sensor network, especially in monitor system environment. The Jamming attacks are the representative energy-consumption DoS attacks in wireless sensor network. These attacks can be launched easily and they are hard to defend. Many researchers had proposed several countermeasures to mitigate the damage caused by the jammer. Hence the impact brought by the jamming attacks becomes less severe after applying the proposed countermeasures. In this thesis we proposed a novel jamming attack model called mobile jamming attack. The mobile jamming attack is more powerful than the traditional jamming attack because it can break the routing on wireless sensor network. Besides, the mobile jamming attack can not be resist by the traditional countermeasures. To defend the mobile jamming attack, we proposed multi-dataflow topologies scheme (multi topologies scheme for short) that can effectually mitigate the damage caused by the mobile jammer. The advantage of the proposed scheme is that base station can receive sensing reports continuously when under attack. Moreover, with some deployed information of sensor nodes, the proposed scheme can roughly locate the mobile jammer or even trace its moving track without increasing additional overhead to the sensor nodes. The simulation results indicate that mobile jamming attack is actually more powerful than the traditional jamming attack and our multi topologies scheme can resist the mobile jamming attack. We consider that the overhead caused by our scheme is acceptable because our scheme also brings the benefit in hop counts. Finally, we show the further research topics and we consider the propose scheme can be extend to resist other routing attacks in wireless sensor network.