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Wireless sensor network comprises of small sensor nodes with limitedresources. Clustered networks have been proposed in many researches to reducethe power consumption in sensor networks. LEACH is one of the most interestedtechniques that offer an efficient way to minimize the power consumption insensor networks. However, due to the characteristics of restricted resourcesand operation in a hostile environment, WSNs are subjected to numerous threatsand are vulnerable to attacks. This research proposes a solution that can beapplied on LEACH to increase the level of security. In Watchdog-LEACH, somenodes are considered as watchdogs and some changes are applied on LEACHprotocol for intrusion detection. Watchdog-LEACH is able to protect against awide range of attacks and it provides security, energy efficiency and memoryefficiency. The result of simulation shows that in comparison to LEACH, theenergy overhead is about 2% so this method is practical and can be applied toWSNs.

Watchdog-LEACH: A new method based on LEACH protocol to Secure Clustered Wireless Sensor Networks