水下声通信物理层密钥生成方案

doi:10.11959/j.issn.1000-436x.2019027

Abstract

Abstract:

To ensure the communication safety of unmanned underwater vehicle,a physical layer key generation scheme of underwater acoustic channel based on orthogonal frequency division multiplexing (OFDM) system was proposed.First,a local pilot assistance channel sounding protocol was proposed to solve the reciprocity impaired caused by the great propagation delay in the underwater acoustic channel,ensure high key randomness and enhance the defenses against nearby eavesdroppers.Secondly,double-layer compensation centralized combined with adaptive guard interval quantization method was proposed to improve key agreement rate and key generation rate.Simulation results show that the scheme effectively overcomes the problems of impaired reciprocity and ensures high key generation rate and high randomness on the premise that the key agreement is superior to the existing schemes.

Key words: unmanned underwater vehicle, local pilot, key generation, nearby eavesdroppers, compensation centralized quantization

CLC Number:

TN918.8+2

Jingmei LIU,Zhiwei SHEN,Qingqing HAN,Jingwei LIU. Underwater acoustic communication physical layer key generation scheme[J]. Journal on Communications, 2019, 40(2): 111-117.

Figures/Tables 8

窃听者位置	窃听者获得信息
距离被窃听者足够远	$H_{A E} (2 j) V_{A} (j) ， H_{B E} (2 j - 1) V_{B} (j)$
靠近Alice	$H_{A E} (2 j) V_{A} (j) ， H_{B A} (2 j - 1) V_{B} (j) (R_{A_{2}})$
靠近Bob	$\begin{matrix} H_{A B} (2 j) V_{A} (j) (R_{B_{1}}) ， H_{B E} (2 j - 1) V_{B} (j) \end{matrix}$

References 18

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项目	说明
OFDM水下声系统参数	子载波数N=256，循环前缀CP=64，
	载频F_C=10 000 Hz，带宽B=18 000 Hz，符号总长T_sym=T_sub+T_cp=0.017 8 s
通信双方参数	移动速度 5 节，v=2.5 m/s，通信距离d_AB=500 m，传播时延T_delay≈0.333 s
水下声信道参数	最大多普勒频移F_d=16.67 Hz，相干时间T_C≈0.03 s，多径数N_ray=25

项目	频数	块内频数	游程	块内游程	傅里叶变换	近似熵	累加和	序列
1节	0.985	0.892	0.986	0.989	0.388	0.958	0.987 0.986	0.254 0.570
5节	0.986	0.894	0.988	0.987	0.350	0.959	0.987 0.990	0.228 0.515
10节	0.985	0.882	0.992	0.987	0.381	0.964	0.985 0.986	0.282 0.543

Underwater acoustic communication physical layer key generation scheme

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