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The authors consider the problem of identifying a node that incorrectly forwards packets in a static wireless ad hoc network. They propose a detection scheme that identifies a misbehaving node based on observations made by neighboring nodes ("Witnesses") near the forwarding node. Without longterm or cumulative observation, the proposed scheme makes an instantaneous decision about whether a node is correctly forwarding a packet. Through extensive analysis of the scheme under various threat scenarios, they show that the scheme can unambiguously identify a misbehaving node when there is no collusion and can detect the existence of misbehaving nodes in the presence of collusion.
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