无线传感器网络随机密钥预分配改进方案

由于无线传感器网络节点能量、存储能力和计算能力的有限性，使传统的网络安全方案受到挑战。针对无线传感器网络的特点，在预共享密钥和随机密钥分发方案的基础上，提出了一种密钥分配方案。该方案采用只保存密钥池中密钥ID号的方法，节省了节点的存储空间。同时，考虑到传感器节点自身资源有限的特点，在满足加密需要的前提下，通过减少会话步骤、简化计算方法来降低传感器节点的工作负荷，从而使得传感器节点存储空间和通信开销都非常小，大大提高了传感器网络的工作效率。

Improved scheme based on random key predistribution for wireless sensor network

Due to the limitation of the nodes energy and the limitation of memory resources and computation ability in the Wireless Sensor Network (WSN), the traditional network security is challenged. Fully considering the characteristics of WSN, a key distribution scheme was proposed based on pre-shared key and random key distribution scheme, in which only ID-number of key in key pool was saved so as to save memory resources of sensor nodes. Furthermore, in view of the characteristics of resource limitation of sensor nodes, the working load of nodes was reduced through decreasing conversation steps and simplifying computation approach under the premise of satisfying the encryption needed. Thus in the scheme, the memory resource of the nodes and the correspondence cost are extremely small, and the working efficiency of the sensor network is improved greatly.