Research on Physical Layer Security Technology for Human-computer Mixing Communication in High-speed Mobility Scenario

doi:10.12382/bgxb.2024.0550

Abstract

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

CLC Number:

TN929.5

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.

Figures/Tables 15

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

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

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

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

Fig.5 DD domain key extraction process

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

Fig.7 Distribution of mapping values for different chaotic systems

Fig.8 Bifurcation diagram for Tent mapping

Fig.9 Tent mapping chaotic distributions

Fig.10 Constellation rotation encryption and decryption process

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

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

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

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

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

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