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Recently, Sensor network have gained popularity for a variety of applications such as patient monitoring, military sensing and tracking, etc. When performing monitoring tasks in hostile environments, security requirements become vital important due to the vulnerability of various attacks. Contemporary wireless sensors have limited battery, computation and memory capacity. The energy-constrained nature of the sensor networks makes the problem of incorporating security very challenging. Designing a security protocol for wireless sensor networks should be taken the conservation of the sensor resources into account. In this paper, we balance the security level and associated energy consumption overhead of wireless sensor networks.