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Wireless Sensor Networks (WSNs) are becoming widespread and pervasive, even in context where dependability and security of the deployed network could be crucial to critical and life-saving tasks. Due to the evolution rush experienced in past few years, several security aspects need to be further investigated. In this paper, the authors present a survey of the main vulnerabilities of WSNs and propose a specific taxonomy. This is a first step towards the definition of a formal security evaluation framework for WSNs, as they introduce in the end of this paper.
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