基于无线信道状态信息的密钥提取方案设计与实现

基于无线信道状态信息(Channel State Information,CSI)的密钥提取技术可以利用无线信道的短时互易性和时空唯一性实现合法通信双方之间的共享密钥分发,且具有计算复杂度低和无需额外设施辅助的优点,是上层加密方案的有效补充.本文分别为无线通信中的合法节点和窃听节点设计了基于CSI的密钥提取方案和被动窃...

Design and Implementation of Key Extraction Scheme Based on Wireless Channel State Information

Since wireless channels have the characteristics of short-term reciprocity and space-time uniqueness, key extraction based on wireless channel state information (CSI) can establish shared key between legitimate communication parties. This technique is considered to be an effective complement to the upper layer encryption scheme with the advantages of low computational complexity and no need of additional facilities. In this paper, we designed a CSI-based key extraction scheme for legitimate wireless communication nodes, and a passive eavesdropping scheme for eavesdropping nodes. Furthermore, we implemented the prototype system of proposed schemes under the time division duplex orthogonal frequency division multiplexing communication system. Finally, we conducted key extraction test experiments in the presence of eavesdropping nodes under two typical communication environments (indoor and outdoor), in each of which we considered both static and mobile nodes. Analysis of test results verify the short-term reciprocity and space-time uniqueness of the wireless channel, and show that the proposed key extraction scheme can achieve considerable key performance and strong system security in typical communication scenarios.