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Many applications in wireless sensor network (WSNs) require energy efficiency. In addition, recently increasing applications sometimes include very sensitive information such as personal related information, and individual health data. However, existing works have not satisfied these requirements of WSN applications. In this paper, we propose an energy-efficient and secure framework for WSNs, which is CSMA and TDMA hybrid approach and provides the multi-channel TDMA based active/sleep scheduling with it. It also includes the security related functionalities to employ a flexible security suite to packets dynamically. We describe the design and implementation of this framework and show the effectiveness of our system by experiments.