Security for Multihop Wireless Networks

Fighting against Black Hole Attacks in Mobile Ad Hoc Networks  ◾  83

e algorithm of the detector module is outlined in Algorithm 1. Basically, the

Bayesian detection function performs analysis over direct observations, obtaining

the values of α and β. If the relationship between α and β exceeds a predefined

tolerance level Φ, the watchdog identifies that node as malicious. ese values of α

and β are also used in the collaborative detection function, according to Equations

4.4 and 4.5. is function operates similarly to the Bayesian detection function,

although it uses secondhand information and other parameters to perform its task.

For the sa