通信学报 ›› 2022, Vol. 43 ›› Issue (12): 45-53.doi: 10.11959/j.issn.1000-436x.2022227

• 专题:信息超材料在移动通信中的应用 • 上一篇    下一篇

面向IoT场景的动态超表面天线密钥生成方法

郝一诺, 钟州, 孙小丽, 金梁   

  1. 信息工程大学信息技术研究所,河南 郑州 450003
  • 修回日期:2022-11-14 出版日期:2022-12-25 发布日期:2022-12-01
  • 作者简介:郝一诺(1997- ),女,江苏徐州人,信息工程大学博士生,主要研究方向为无线物理层安全
    钟州(1982- ),男,吉林公主岭人,博士,信息工程大学副教授,主要研究方向为移动通信技术、无线物理层安全
    孙小丽(1992- ),女,河南南阳人,博士,信息工程大学讲师,主要研究方向为毫米波、无线物理层安全
    金梁(1969- ),男,北京人,博士,信息工程大学教授、博士生导师,主要研究方向为移动通信技术、阵列信号处理、无线内生安全
  • 基金资助:
    国家自然科学基金资助项目(U22A2001);国家自然科学基金资助项目(61871404)

DMA-based key generation method for IoT scenario

Yinuo HAO, Zhou ZHONG, Xiaoli SUN, Liang JIN   

  1. Institute of Information Technology, Information Engineering University, Zhengzhou 450003, China
  • Revised:2022-11-14 Online:2022-12-25 Published:2022-12-01
  • Supported by:
    The National Natural Science Foundation of China(U22A2001);The National Natural Science Foundation of China(61871404)

摘要:

针对物联网(IoT)场景中信道密钥更新缓慢、生成速率低、节点资源受限等问题,利用动态超表面天线(DMA)的捷变性和可重构特性提高接收信号的时变性和随机性,设计了基于DMA的物理层密钥生成方法。首先,发送端采用DMA对信号进行随机捷变加权并发送给接收端,在不影响信号透明接收的前提下增强了信号的随机性;然后,收发双方从接收信号中提取密钥。所提方法将DMA系数的捷变性和随机性、信号源的随机性以及自然信道的随机性三者叠加增强,构造复合信道提高密钥源随机性,并将信道估计开销由终端转移至基站,有效降低了通信系统的开销和时延,适用于资源非对称、节点轻量级的IoT场景。仿真结果表明,所提方法可以有效提高准静态信道下的密钥生成速率,并且所生成的物理层密钥通过了NIST指标测试。

关键词: 物理层密钥生成, 无线通信, 动态超表面天线, 密钥生成速率

Abstract:

Aiming at the problems of slow update frequency of channel key, low generation rate and limited node resources in the IoT scenario, a DMA-based physical layer key generation method was proposed, by using the agility and reconfigurability of DMA to improve the time variability and randomness of received signal.Firstly, DMA was used by the transmitter to randomly weight the signal and send it to the receiver, which could enhance the randomness of signals on the premise of ensuring the transparent reception of the signal.Then, the key from the received signal was extracted by the sender and receiver.By combining the rapid changeability and randomness of DMA, the randomness of signal source and the randomness of natural channel, a composite channel was constructed to improve the randomness of the key source.In addition, the channel estimation was transfered overhead from the terminal to the base station, which effectively reduced the overhead and delay of the communication system, and was suitable for IoT scenarios with asymmetric resources and lightweight equipment.Simulation results show that the proposed method can effectively improve the key generation rate in quasi-static scenarios, and the generated physical layer key has passed the NIST test.

Key words: physical layer key generation, wireless communication, dynamic metasurface antenna, key generation rate

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