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Modern sensors are portable, embeddable, they offer multiple connectivity options and enough processing power that allows the performance of advanced operations. Multiple sensors can be used together forming a Wireless Sensor Network (WSN). Ubiquitous WSNs are expected to play a significant role in the future, assisting users in their everyday life. In this paper, the authors present an intriguing application of WSNs: health monitoring of hospital patients. They focus on the security aspects of this application and identify security threats and requirements. Moreover, they argue that existing security solutions are energy hungry, therefore they are inappropriate for WSNs and they propose a new security design approach: adaptable security.
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