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MANETs are gaining popularity now days due to flexibility and communication without the infrastructure or centralized access point. The dynamic changing nature of network topology makes any node in MANET to leave and join the network at any point of time. From a security design perspective, MANETs have no clear line of defense; i.e. no inbuilt security. Thus MANET is accessible to both legitimate network users and malicious attackers. There are many routing attacks caused due to lack of security .The one of most suitable protocol is AODV for ad-hoc networks and it is vulnerable to black hole attack by malicious nodes. It is similar to the black hole in the universe in which things disappear.
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