By Syed Muhammad Hassan Zaidi, Manzoor Hashmani
A Mobile AdHoc Network (MANET) is a network of nodes that communicating with each other without help from a fixed network infrastructure. Securing MANETS is an important part of deploying and utilizing them, since they are often used in critical applications like Commercial, Military, and Private sector where data and communications integrity in important. To obtain an acceptable level of security, conventional security solutions are supposed to be attached with an intrusion detection mechanism. In this thesis, we analyze few wireless Adhoc security attacks and vulnerabilities relative to topology control schemes and evaluate their performance under hostile environments. We propose a Distributed Intrusion Detection System (DIDS) that incorporates rule- based cluster topology relevant to Mobile Adhoc networks (MANETs) to determine their security/performance in application specific environments. DIDS draws inferences of intrusion by comparing anomalous patterns from packet traces of transmit and receive signal powers, ratio of packet arrival rates and anomaly in radio receiver packet power thresholds using buffer window count. We evaluate intrusion detection mechanism on a jammer attack and observe the effect on the network throughput. Our approach is simulated using the OPNET simulator. Simulation results show that the detection capabilities of scheme under a denial of service (DoS) (jammer) attack, increases the bit error rates, increase in transmit delay responses and considerable decrease in both the signal to noise powers and the average network throughput due to the presence of jammer attack which forms the baseline for analysis required to maintain energy efficiency and improve security in Adhoc network.