An optimized intrusion response system for MANET:

Mobile Ad-Hoc NETworks (MANETs) are highly vulnerable to various security threats due to the numerous constraints they present, such as the absence of a fixed infrastructure, the dynamic topology change, their dependence on cooperative communication, the limited resource constraints, the unreliability of wireless links, and most importantly the lack of a clear line of defence. In this paper, MANET security issues are addressed through a comprehensive analysis of some common security threats, mainly blackhole, grayhole and the selfish behaviour attack. This has led to the building of a new intrusion response system denoted MASID-R-SA. This system is capable of providing autonomic systematic responses based on the intrusions’ measured severity level. The main objective of this approach is to better survive both single and multiple intrusion scenarios while minimizing the negative consequences of adopting typical static responses. We demonstrate through simulations the effectiveness of the proposed intrusion response system in appropriately responding to both single and multiple intrusions. For instance, a true detection rate of 97,23% and an average of 96,33% response success rate are achieved. The study revealed, also, that the proposed system solves some critical issues related to network partitioning and remerging efficiently.