Abstract: Since nodes in wireless sensor networks have limited capabilities,messages are generally transmitted between nodes through multi-hop. The multi-hop routing protocols provide a lot of convenience for the selective forwarding attack. As a result, a random checkpoint based multi-hop acknowledge scheme to detect selective forwarding attacks in WSNs was brought out. At the same time, IBE and LEACH were adopted to improve the formal detecting scheme.Firstly, the overall framework of defense scheme and its working method were given, then, the scheme was simulated in the NS2 environment, thinking about many factor, such as the number of checkpoints, the calculating speed and consumption, the storage requirements, the robustness and so on. The results show that the WSNs' security has improved.

Key words: Wireless sensor networks,Location ID key binding,Selective forwarding attacks,Intrusion detection