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中文摘要：
针对网络中相邻节点对通信、局部广播通信及新节点认证中的安全问题，提出无线传感器网络中基于临时初始密钥的密钥管理协议-PLA协议.该协议要求在网络部署的时候为每个节点分配唯一的标识符和一个临时初始密钥.节点基于临时初始密钥和相关信息建立用于节点对之间通信的密钥（Pairwise Key，简称点对密钥）、用于与其所有邻居节点同时通信的局部广播密钥（Local Broadcast Key，简称局部广播密钥）以及用于认证新加入节点的认证密钥（Authentication Key，简称认证密钥）.与现有协议如LEAP协议和OTMK协议相比较，该协议降低了能耗，提高了安全性.
英文摘要：
This paper proposes a key management protocol based on transitory initial key in wireless sensor networks to solve the security problems in Pairwise communications, Local broadcast communications and Authentication of the newly joined sensor nodes in such networks, PLA for short. When deploying a wireless sensor network, each node is assigned a unique identifier and a transitory initial key. Each node computes a pairwise key, a local broadcast key and an authentication key based on the transitory initial key and some related information. Theoretical analysis shows that the proposed PLA protocol is more secure and more energy efficient than existing protocols such as LEAP and OTMK.
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