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Wireless Mesh Networks (WMNs) are multi-hop networks in which the mesh clients rely on static mesh routers (or directly via other mesh clients) to relay data from one point to another in a multihop fashion. WMN gained significant attention because of the numerous applications it supports, e.g., broadband home networking, community and neighborhood networks, delivering video, building automation, in entertainment and sporting venues etc. But the main challenge of these multihop networks is the susceptibility to various security threats. In this paper, the authors address the problem of gray hole attack in which a malicious node refuses to forward a subset of the packets it receives.
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