Multicast Encryption Infrastructure for Security in Sensor Networks

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Executive Summary

Designing secure sensor networks is difficult. The authors propose an approach that uses multicast communications and requires fewer encryptions than pairwise communications. The network is partitioned into multicast regions; each region is managed by a sensor node chosen to act as a keyserver. The keyservers solicit nodes in their neighborhood to join the local multicast tree. The keyserver generates a binary tree of keys to maintain communication within the multicast region using a shared key. Their approach supports a distributed key agreement protocol that identifies the compromised keys and supports membership changes with minimum system overhead.

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