基于安全极化码的密钥协商方法  

Secret Key Agreement Based on Secure Polar Code

作　　者：张胜军[1] 钟州[1] 金梁[1] 黄开枝[1] ZHANG Shengjun;ZHONG Zhou;JIN Liang;HUANG Kaizhi(National Digital Switching System Engineering &Technological R&D Center, Zhengzhou 450002, China)

机构地区：[1]国家数字交换系统工程技术研究中心

出　　处：《电子与信息学报》2019年第6期1413-1419,共7页Journal of Electronics & Information Technology

基　　金：国家重点研发计划(2017YFB0801903);国家自然科学基金(61601514,61501516,61521003)~~

摘　　要：针对密钥协商过程中的信息泄露问题,该文综合考虑信息协商和隐私放大提出了基于安全极化码(SPC)的密钥协商方法,打通了从量化误比特率(QBER)条件到密钥中断概率(SKOP)需求的桥梁。首先,将QBER建模为加性高斯白噪声(AWGN)信道的传输误比特率(TBER),进而将QBER优势转化为AWGN信道优势;然后,利用高斯近似计算出各极化子信道的传输错误概率,并进一步推导出安全极化码的译码误比特率上下界;最后,根据密钥中断概率阈值利用遗传算法构造出合适的安全极化码实现密钥协商。仿真结果表明,该文所提的密钥协商方法能够满足设计的密钥中断概率需求,且具有比低密度奇偶校验(LDPC)码更高的密钥协商效率。Focusing on the problem of information leakage in secret key agreement, combining information reconciliation and privacy amplification, a method based on Secure Polar Code (SPC) is proposed, which builds the bridge from the condition of Quantized Bit Error Rate (QBER) to the requirement of Secret Key Outage Probability (SKOP). Firstly, QBER is modeled as the Transmitted Bit Error Rate (TBER) of Additional White Gaussian Noise (AWGN) channel, so the advantage of QBER is converted to the advantage of AWGN channel;Then, the TBER of each polarized sub-channel is calculated by Gaussian approximation, and the upper and lower bounds of decoded bit error rate are also derived. Finally, the SPC is constructed based on generic algorithm and SKOP threshold. Simulation results show that the proposed method satisfies the requirement of SKOP and achieves higher secret key agreement efficiency, compared with Low Density Parity Check (LDPC)-based method.

关 键 词：密钥协商 物理层安全 安全极化码 隐私放大 

分 类 号：TN918.91[电子电信—通信与信息系统]