A wireless secret key generation method based on Chinese remainder theorem in FDD systems  

作　　者：WANG WenJie JIANG HongYan XIA XiangGen MU PengCheng YIN QinYe 

机构地区：[1]Ministry of Education Key Lab for Intelligent Networks and Network Security,Xi'an Jiaotong University Xi'an 710049,China [2]Electrical and Computer Engineering,University of Delaware,Newark,DE 19716,USA [3]Chonbuk National University,Jeonju,South Korea

出　　处：《Science China(Information Sciences)》2012年第7期1605-1616,共12页中国科学（信息科学）（英文版）

基　　金：supported in part by National Natural Science Foundation of China (Grant No. 61071125);Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No.60921003);Xia’s work was supported in part by the National Science Foundation (NSF) Grant No. CCF-0964500);Air Force Office of Scientific Research (AFOSR) (Grant No. FA9550-12-1-0055);World Class University (WCU) Program,National Research Foundation,Korea

摘　　要：The wireless physical channel parameters are recently used to provide secret key. However, the key generation usually suffers from the quantization errors due to the noise, which decreases the key agreement ratio （KAR） between authorized users. Most existing approaches achieve high KAR by discarding some channel parameters which may lower the key generation efficiency and therefore lower the encryption strength. In the frequency-division duplex （FDD） systems, the number of reciprocal parameters, such as the multipath angle and delay, is limited. Therefore how to find a quantization method with high KAR and encryption strength is one of the major problems for secret key generation in FDD systems. In this paper, a robust quantization scheme based on grouping and shifting is proposed, in which all the available parameters are used for key generation. In addition, a key mapping method with error correction based on Chinese remainder theorem （CRT） is proposed to further improve the KAR performance. Simulations demonstrate the effectiveness of the proposed method.The wireless physical channel parameters are recently used to provide secret key. However, the key generation usually suffers from the quantization errors due to the noise, which decreases the key agreement ratio （KAR） between authorized users. Most existing approaches achieve high KAR by discarding some channel parameters which may lower the key generation efficiency and therefore lower the encryption strength. In the frequency-division duplex （FDD） systems, the number of reciprocal parameters, such as the multipath angle and delay, is limited. Therefore how to find a quantization method with high KAR and encryption strength is one of the major problems for secret key generation in FDD systems. In this paper, a robust quantization scheme based on grouping and shifting is proposed, in which all the available parameters are used for key generation. In addition, a key mapping method with error correction based on Chinese remainder theorem （CRT） is proposed to further improve the KAR performance. Simulations demonstrate the effectiveness of the proposed method.

关 键 词：wireless communication security secret key generation FDD CRT angle and delay estimation 

分 类 号：TP309[自动化与计算机技术—计算机系统结构] TN929.533[自动化与计算机技术—计算机科学与技术]