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The present paper is dedicated to the study of attacks and countermeasures in MANET. After a short introduction to what the Mobile Ad-hoc Networks (MANETs) are and network security the authors present a survey of various attacks in MANETs pertaining to fail routing protocols. They present the different tools used by these attacks and the mechanisms used by the secured routing protocols to counter them. They also study a mechanism of security, named the reputation, proposed for the MANETs and the protocol which implements it. They also propose a secure mechanism which is based on the reputation. Their work ends with a proposal analytical model to the modules of their mechanism.
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