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In recent years mobile ad hoc networks have become a very popular research topic. By providing communications in the absence of a fixed infrastructure MANETs are an attractive technology for many applications such as rescue operations, tactical operations, environmental monitoring, conferences, and the like. But at present, the security issues on mobile ad hoc network have become one of the primary concerns. The MANET is more vulnerable to attacks as compared to wired networks due to distributed nature and lacks of infrastructure. Those vulnerabilities are nature of the MANET structure that cannot be removed easily. Attacks prevention techniques such as a authentication and encryption, can be used as medium of defense for decreasing the possibilities of attacks.
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