无线传感器网络的安全性是目前研究的热点。传统基于临时初始密钥和基于密钥池预分配的方案难以在网络连通性和节点存储计算消耗之间有效平衡，网络生命期内使用固定不变的初始密钥/密钥池难以抵抗节点捕获攻击。本文基于中国剩余定理提出了传感器网络密钥管理协议，每个节点携带较少的密钥素材，能够实现网络最大连通，并具有较少的存储空间和计算与通信能耗；基于时间概念分多个阶段部署传感器节点时，发布的密钥素材在不同的节点部署阶段相应变化，使得网络具有自愈合功能，从而具有较强的抗节点捕获攻击。%Research of security problem in wireless sensor networks( WSNs) is a challenging hotspot over the last ten years. Traditional schemes those based on temporary initial key and key pre-distribution using key pools are difficult to be tradeoff between the network connectivity and node storage space,and the same initial key or the key pool in these approaches is also vulnerable to against node capture attacks,this leaves key management as a fundamental research topic in the field of WSNs security. In this paper,a novel time-based key management scheme for WSNs using the Chinese Remainder Theorem is proposed, in our strategy each sensor node with fewer key material is deployed over different time stage,and the important parameter in key materials change correspondingly over time. We introduce the process of pair-wise key create, node addition and revocation, and show that the proposed key management solution can achieve maximum network connectivity with less energy consumption about communication and calculation,and also make the network has self-healing function and strong resistance to node capture attack.
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