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Mobile Ad-hoc NETworks (MANETs) is an appealing technology that has attracted lots of research efforts over past years. Although the principle of wireless, structure-less, dynamic networks is attractive, there are still some major flaws that prevent commercial expansion. Security is one of these main barriers; MANETs are known to be particularly vulnerable to security attack. In this paper the authors discuss the secure routing in MANETs and evaluate the performance and security of the some secure protocol of MANETs, ns-2 simulations are performed to evaluate the impact of Mobility of the different number of nodes also malicious threats and attacks in the simulation environments .
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