一种基于多项式的无线传感器网络密钥管理方案*

提出一种基于多项式的无线传感器网络密钥管理方案。基站通过计算节点秘密信息构成的多项式来生成网络的全局密钥，节点通过全局密钥可以认证网络中的合法节点。节点用全局密钥经过Diffie-Hellman密钥交换来生成与邻居节点之间唯一的会话密钥。该方案能够动态更新密钥，从而解决了由于节点被捕获所导致的信息泄露、密钥连通性下降和密钥更新通信开销大等问题。性能分析表明，该方案与现有的密钥预分配方案相比，具有更低的存储开销、通信开销、良好的扩展性和连通性。

Key management scheme based on polynomial for WSN

This paper presented a key management scheme based on polynomial for wireless sensor network (WSN). The base station calculated the polynomial formed by the secret information of the nodes to generate a global network key, through which the nodes could certify the legitimate nodes in the network. The nodes generated the unique session keys between the neighbor nodes through the global network key after Diffie-Hellman key exchange. This scheme could dynamically update the keys so as to solve several problems such as: information disclosure when some nodes were captured, the decline of key connectivity and higher communication overhead when key was renewed. The analysis of performance show that this scheme has a lower storage cost, a lower communication overhead, good scalability and connectivity, compared to some existing pre-distribution schemes.