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Problem statement: In Mobile Ad hoc Network (MANET), both the routing layer and the&#13; Medium Access Control (MAC) layer are vulnerable to several attacks. There are very few techniques&#13; to detect and isolate the attacks of both these layers simultaneously. In this study, we developed a&#13; combined solution for routing and MAC layer attacks. Approach: Our approach, makes use of three&#13; techniques simultaneously which consists of a cumulative frequency based detection technique for&#13; detecting MAC layers attacks, data forwarding behavior based detection technique for detecting packet&#13; drops and message authentication code based technique for packet modification. Results: Our&#13; combined solution presents a reputation value for detecting the malicious nodes and isolates them from&#13; further network participation till its revocation. Our approach periodically checks all nodes, including&#13; the isolated nodes, at regular time period &#955;. A node which recovers from its misbehaving condition is&#13; revoked to its normal condition after the time period &#955;. Conclusion/Recommendations: By&#13; simulation results, we show that our combined solution provides more security by increased packet&#13; delivery ratio and reduced packet drops. We also shown that our approach has less overhead compared&#13; to the existing technique

A Combined Solution for Routing and Medium Access Control Layer Attacks in Mobile Ad Hoc Networks