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Wireless Sensor Network (WSN) has been proven a useful technology for perceiving information about the physical world and as a consequence has been used in many applications such as measurement of temperature, radiation, flow of liquids, etc. The nature of WSNs and also their vulnerabilities to attacks requires a special concern towards their security. The decision making in a WSN is essential for carrying out certain tasks as it aids sensors establish collaborations. In order to assist this process, trust management systems could play a relevant role. In the context of a network, trust may help its elements to decide whether another member of the same network is being uncooperative or malicious.
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