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A black hole attack on a MANET refers to an attack by a malicious node, which forcibly acquires the route from a source to a destination by the falsification of sequence number and hop count of the routing message. A selective black hole is a node that can optionally and alternately perform a black hole attack or perform as a normal node. In this paper, several IDS (Intrusion Detection System) nodes are deployed in MANETs in order to detect and prevent selective black hole attacks.
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