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ZigBee uses the network security and application profile layers of the IEEE 802.15.4 and ZigBee Alliance standards for reliable, low-powered, wireless data communications. However, the ZigBee protocol has some security weaknesses for newly joining devices. In this paper, these weaknesses are analyzed and a novel elliptical curve identity-based cryptography (ECIC) protocol is presented to improve the security level of ZigBee networks. The proposed method provides perfect forward secrecy and enables network key transmission between nodes. Therefore, the traffic concentrated on the trustcenter is diminished, and the network efficiency is improved by reducing the key establishment time and processing burden on each sensor node, thereby reducing the overall energy consumption of the sensor network. Copyright © 2010 John Wiley & Sons, Ltd. (The proposed elliptical curve identity-based cryptography (ECIC) ZigBee provides perfect forward secrecy and enables network key transmission between nodes. As a result the protocol can reduce the traffic concentrated on the trustcenter and increase the network efficiency compared to when using the ZigBee protocol based on the network security and application profile layers of the IEEE 802.15.4 and ZigBee Alliance. Key complexity comparison of the ZigBee protocol (a) and the ECIC ZigBee protocol (b) is illustrated.)