A dynamic monitoring for energy consumption reduction of a trust-based intrusion detection system in mobile Ad-hoc networks

Nodes in MANETs are subject to many security leaks, because the communication between nodes occurs using the wireless medium without an infrastructure. Each node has a limited amount of energy available, because they are powered by batteries. Performing monitoring operations to establish whether a node is fair or not requires a large amount of energy, hence their reduction is desirable when they are not needed. A node behavior could dynamically change over time, because it could be compromised by external agents, or it could have a selfish behavior due to energy saving reasons. Thus, monitoring is needed also when a node behavior is fair in a given period of time. The proposed approach of dynamic monitoring could help in saving energy without affecting the accuracy of the IDS. For this purpose, we introduced a function that changes the probability of monitoring a packet depending on the trustworthiness of the involved agent. The results of this work show that the detection accuracy can be unaltered under some conditions, improving the energy saving.