无线传感器网络中的多次密钥协商

Repetitious Key Negotiations in Wireless Sensor Networks

无线传感器网络链路损耗大，需要进行多次密钥协商。为研究增加密钥协商次数对提高网络安全连通率的效力，引入加权安全连通率和性价比（CPR）2个指标，并在TOSSIM平台上进行仿真验证。CPR随协商次数的增加而降低，仿真结果及理论分析表明，为获得较高安全连通率，重复协商次数取3-4较合适。

Key negotiation needs several times in Wireless Sensor Networks（WSN） because of high loss rate. In order to research the effectiveness of repetitious key negotiations on heightening secure connectivity, it proposes two metrics named the weighing secure connectivity and Cost Performance Ratio（CPR）, and it processes the simulation experiments on TOSSIM platform. CPR becomes lower and lower as the number of key negotiations increases. Simulation results and analysis show that 3-4 times repetitious key negotiations are more suitable for high secure connectivity.