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Wireless Sensor Networks (WSN) is an emerging technology and day by day it is attracting the attention of researchers with its challenging characteristics and diversified application domain. The more researchers try to develop further cost and energy efficient computing devices and algorithms for WSN, the more challenging it becomes to fit the security of WSN into that constrained environment. However, security is crucial to the success of applying WSN. So, familiarity with the security aspects of WSN is essential before designing WSN system. This paper studies the security problems of WSN based on its resource restricted design and deployment characteristics and the security requirements for designing a secure WSN.
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