Mitigating Large Propagation Delay by Mitigating Wormhole Attack in Mobile Ad Hoc Network
Ranjeeta Siwach, Vanditaa Kaul · 2013
Abstract- Wormhole attacks, in which colluding attackers with out-of-band communication links record packets (or bits) at one location and replay at another, cause far away nodes to consider themselves as neighbours to one another. Under this attack, two faraway malicious nodes can collude together using either wired link or directional antenna, to give an impression that they are only one hop away. We presents NEVO, in which nodes passively monitor (overhear) the forwarding of broadcast type packets by their neighbours and use the send and overhear times of trans- missions of these packets, to mitigate these wormhole attacks. NEVO does not require synchronized clocks, special hardware support, or any special capability. NEVO can detect almost all instances of wormhole attacks and is virtually independent of the routing protocol used. NEVO has a disadvantage that it does not consider the impact of clock drift. On the other hand, NEVO uses network layer verification, which takes more time to complete, and thus require clock drift correction. In this paper, we use an approach which consider the impact of clock drift and do not require any correction in network layer.