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Wireless Network Systems are usually deployed in hostile environments where they en-countered a wide variety of malicious attacks. A Wireless Sensor Network (WSN) is a wireless network composed of a large number of sensor nodes. In WSNs the scarcest resource is energy which includes low power, less storage space, low computation ability and short communication range. For this reason, algorithmic research in WSN mostly focuses on the study and design of energy aware algorithms for data computation. This problem becomes harder in the case of security, as most of the security algorithms are quite heavy. Although symmetric cryptography may be one of the approaches to solve the problem due to their small computation requirement.
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