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This paper focuses on wormhole attacks detection in wireless sensor networks. The wormhole attacks are particularly challenging to deal with since the adversary does not need to compromise any nodes and can use laptops or other wireless devices to send the packets on a low latency channel. This paper introduces an easy and effective method to detect and locate the wormholes: Since beacon nodes are assumed to know their coordinates, the straight line distance between each pair of them can be calculated and then compared with the corresponding hop distance, which in this paper equals hop counts ? node's transmission range R. Dramatic difference may emerge because of an existing wormhole.
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