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As a security primitive, key establishment plays the most crucial role in the designing of the security mechanism in the Wireless Sensor Networks (WSNs). Unfortunately, the resource limitation of sensor nodes poses a great challenge for designing an efficient and effective key establishment scheme for WSNs. In this paper, the authors propose an effective key pre-distribution scheme using double keyed-hash chain schemes. In the proposed scheme, there are two key pools: upward key pools and downward key pools, and the key ring in each sensor is picked from these two key pools. The proposed scheme is analyzed based on connectivity, resistance against attacks, memory consumption and communication overhead.
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