TRUST SYSTEM AND ENERGY EFFICIENT OPTIMIZATION USINGWATCHDOG TECHNIQUES

Abstract

Watchdog technique is a fundamental building block to many trust systems that are designed for securingwireless sensor networks (WSNs). Unfortunately, this kind of technique consumes much energy and hencelargely limits the lifespan of WSN. Although the state-of-the-art studies have realized the importance of trust systems’ efficiency in WSNs and proposed several preliminary solutions, they have overlooked to optimize thewatchdog technique, which is perhaps among the top energy-consuming units. We optimize watchdogtechniques in two levels. First, we optimize watchdog locations by considering the fact: although sensor nodeswhich are located more closely may consume less energy to monitor each other due to shorter communicationdistance, these nodes are more likely of being compromised together and launch collaborative attacks