98 ◾ Security for Multihop Wireless Networks
4.8 Conclusions
is chapter discussed the problems related to the black hole attacks in MANETs,
and some of the solutions proposed in the literature during the past few years to
deal with them. e concept and functionality of a watchdog as basic IDS has also
been introduced. e basic watchdog has been improved to enhance its accuracy
and detection speed, using a Bayesian filter to remove from the collected data those
measurements that are useless due to the nature of the wireless channel and mobil-
ity. Another enhancement to this technique, which aims at taking advantage of the
cooperative essence of the MANET, has also been presented, allowing nodes to share
neighbor reputations to improve both ...