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The distributed nature of the CSMA/CA based wireless protocols, e.g., the IEEE 802.11 Distributed Coordinated Function (DCF), allows malicious nodes to deliberately manipulate their back-off parameters and thus unfairly gain a large share of the network throughput. In this paper, the authors first design a real-time back-off misbehavior detector, termed as the Fair Share detector (FS detector), which exploits the non-parametric CUmulative SUM (CUSUM) test to quickly find a selfish malicious node without any a priori knowledge of the statistics of the selfish misbehavior.
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