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A Wireless Sensor Networks (WSNs) is an infrastructure less network where each mobile node is connected by a dynamic link. In this network each node or sensor follows the "Save and forward" strategy for moving the information because each node asks for the further connection to its neighboring nodes. So, the two issues should be under consideration, when the authors design WSNs, one is security and second is life of system. They choose the first because various possible security threats encountered in a wireless sensor network. So, in this paper, they investigate on different security issues and propose a framework for a secure WSNs system.
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