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In this paper, the authors have modeled traffic and energy consumption in a secured, power managed wireless sensor network implemented using IEEE 802.15.4 technology. The network is secured through a variant of the secure socket layer protocol, with ephemeral Diffie - Hellman key exchange using elliptic curve cryptography. Their traffic and energy model allows calculations of cluster populations under the simultaneous constraints of prescribed secure event sensing reliability and lifetime of the whole network. Traditionally link key distribution in Wireless Sensor Networks (WSN-s) was achieved by pre-installing link keys or master secret as a basis for link key derivation. In the cluster based environment of beacon enabled IEEE 802.15.4 this means that every node has to share a dedicated secret with the coordinator.
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