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Ad-hoc network is the network comprised of wireless nodes. It is basically infrastructure less network which is self configured i.e. the connections are established without any centralized administration. MANET has no clear line of defense so it is accessible to both legitimate network users and malicious attackers. In the presence of malicious nodes, one of the main challenges in MANET is to design the robust security solution that can prevent MANET from various DDOS attacks. Different mechanisms have been proposed using various cryptographic techniques to countermeasures these attacks against MANET.
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