RISM - Reputation Based Intrusion Detection System for Mobile Adhoc Networks

This paper proposes a combination of an Intrusion Detection System with a routing protocol to strengthen the defense of a Mobile Adhoc Network. Our system is Socially Inspired, since we use the new paradigm of Reputation inherited from human behavior. The proposed IDS has a unique char- acteristic of being Semi-distributed, since it neither distributes its Observation results globally nor keeps them entirely locally; however, managing to communicate this vital information without accretion of the network traffic. This innovative approach also avoids void assumptions and complex calculations for calculating and maintaining trust values used to estimate the reliability of other nodes' observations. A robust Path Manager and Monitor system and Redemption and Fading concepts are other salient features of this design. The design has shown to outperform normal DSR in terms of Packet Delivery Ratio and Routing Overhead even when upto half of nodes in the network behave as malicious.