高速移动场景中人机混编通信物理层安全技术

doi:10.12382/bgxb.2024.0550

摘要/Abstract

摘要：

针对高速移动场景中人机混编通信模式下的安全问题展开研究,提出基于时延多普勒(Delay Doppler, DD)域密钥提取的正交时频空—物理层加密(Orthogonal Time Frequency Space-Physical Layer Encryption, OTFS-PLE)方法。该方法充分利用快时变信道在DD域中的稀疏性,高效准确地估计信道路径的增益、多普勒频移和时延大小,生成安全可靠的初始密钥,再通过Tent序列将初始密钥扩展成加密密钥,根据密钥对OTFS的星座点进行相位扰乱,实现高效的加解密。该方法解决了高速移动场景人机混编通信中的密钥提取难的问题,能生成可靠的密钥并实现人机混编系统安全高效的加密通信。

关键词: 物理层加密, 高速移动场景, 机混编通信模式, 正交时频空

Abstract:

The security issues in the human-computer hybrid communication mode in high-speed mobile scenarios are investigated. An orthogonal time frequency space-physical layer encryption (OTFS-PLE) method based on delay Doppler (DD) domain key extraction is proposed. The method fully utilizes the sparsity of fast time-varying channels in the DD domain to efficiently and accurately estimate the gain, Doppler shift and delay magnitude of the channel path to generate a secure and reliable initial key. Secondly, the initial key is expanded into an encryption key through a Tent sequence, and the phase scrambling of the constellation points of OTFS is made according to the key to realize efficient encryption and decryption. This method is used to solve the problem of difficult key extraction in human-computer mixing communication in high-speed mobile scenarios, generates the reliable keys and realizes the secure and efficient encrypted communication in human-computer mixing systems.

Key words: physical layer encryption, high-speed mobile scenario, human-machine mixing communication mode, orthogonal time frequency space

中图分类号:

TN929.5

李为, 鲁信金, 仲健, 陈继林, 何龙. 高速移动场景中人机混编通信物理层安全技术[J]. 兵工学报, 2024, 45(S1): 322-330.

LI Wei, LU Xinjin, ZHONG Jian, CHEN Jilin, HE Long. Research on Physical Layer Security Technology for Human-computer Mixing Communication in High-speed Mobility Scenario[J]. Acta Armamentarii, 2024, 45(S1): 322-330.

图/表 15

图1 一些典型的人机混编高速移动场景

Fig.1 Some typical human-computer hybrid high-speed movement scenarios

图2 基于DD域密钥提取的OTFS-PLE系统模型

Fig.2 OTFS-PLE system model based on DD domain key extraction

图3 TF域和DD域快时变信道响应示意图

Fig.3 Schematic diagram of fast time-varying channel response in TF and DD domains

图4 移动场景中不同时刻DD域信道响应表征

Fig.4 Characterisation of DD domain channel response at different moments in mobile scenarios

图5 DD域密钥提取流程

Fig.5 DD domain key extraction process

图6 移动场景中不同时刻DD域信道响应表征

Fig.6 Characterisation of DD domain channel response at different moments in mobile scenarios

图7 移动场景中不同时刻DD域信道响应表征

Fig.7 Distribution of mapping values for different chaotic systems

图8 Tent映射的分岔图

Fig.8 Bifurcation diagram for Tent mapping

图9 Tent映射混沌分布

Fig.9 Tent mapping chaotic distributions

图10 星座旋转加解密流程

Fig.10 Constellation rotation encryption and decryption process

表1 仿真参数设置

Table 1 Simulation parameter setting

参数	数值
M(时延方格数)	32
N(多普勒方格数)	16
载波频率	4×10⁹Hz
子载波间隔	15kHz
相对移动速度	200km/h

表2 密钥序列NIST测试结果

Table 2 Key sequence NIST test results

参数	数值
频率检验	0.350485
块内频数检验	0.066882
累加和检验	0.122325
游程检验	0.991468
最长游程检验	0.739918
二元矩阵秩检验	0.122325
离散傅里叶变换检验	0.350485
非重叠模块匹配检验	0.911413
重叠模块匹配检验	0.911413
随机游动检验	0.035174
随机游动状态频数检验	0.653238
线性复杂度检验	0.739918

图11 不同φ值发射信号星座熵

Fig.11 Constellation entropy of emitted signals with different φ-values

图12 不同φ值接收信号星座熵

Fig.12 Constellation entropy of received signals with different φ-values

图13 不同速度PLE-OTFS与OTFS误码率对比

Fig.13 BERs of PLE-OTFS and OTFS at different speeds

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