Wireless Network: Attacks and Countermeasures

  Abstract :MANETs are more vulnerable to various attacks, out of which gray hole(selective packet drops) attack is one of the severe attack. The existing security mechanisms are inadequate to detect gray hole attack. In this paper, we propose a reputation based IDS for high detection rate of gary hole attack with less control overhead. Our proposed IDS works based on node independent approach, and key functionalities of this approach are 1) average number of collisions and 2) additive increase/ exponential decrease of node reputation value. Our Simulation results show that the proposed mechanism has a significantly high detection rate which improves network performance such as goodput, packet delivery ratio.  FULL PAPER: Reputation Based IDS for Gray hole Attack in MANETs

Abstract: Wireless Mesh Networks (WMNs) have emerged as a promising technology for a broad range of applications due to their self-organizing, self-configuring and self-healing capability, in addition to their low cost and easy maintenance. Securing WMNs is more challenging and complex issue due to their inherent characteristics such as shared wireless medium, multi-hop and inter-network communication, highly dynamic  network topology  and decentralized architecture. These vulnerable features expose the WMNs to several types of attacks in MAC layer. The existing MAC layer standards and implementations are inadequate to secure these features and fail to provide comprehensive security solutions to protect both backbone and client mesh. Hence, there is a need for developing efficient, scalable and integrated security solutions for WMNs. In this paper, we classify the MAC layer attacks and analyze the existing countermeasures. Based on attacks classification and countermeasures analysis