Secure Transmission Method for Multi-User Multi-Eavesdropper Systems Under Unknown CSI with Double-RIS

doi:10.11871/jfdc.issn.2096-742X.2025.06.005

Frontiers of Data and Computing ›› 2025, Vol. 7 ›› Issue (6): 44-54.

CSTR: 32002.14.jfdc.CN10-1649/TP.2025.06.005

doi: 10.11871/jfdc.issn.2096-742X.2025.06.005

• Special Issue: Call for Papers for the 40th National Conference on Computer Security • Previous Articles Next Articles

Secure Transmission Method for Multi-User Multi-Eavesdropper Systems Under Unknown CSI with Double-RIS

CHEN Xinwu^1,^2,^*(),HAN Shuai²

1. The People’s Procuratorate of Liaoning Province, Shenyang, Liaoning 110033, China
2. Harbin Institute of Technology, Harbin, Heilongjiang 150001, China

Received:2025-07-25 Online:2025-12-20 Published:2025-12-17
Contact: CHEN Xinwu E-mail:cxw808@qq.com

Abstract

Abstract:

[Objective] This study investigates communication security in double-reconfigurable intelligent surface (RIS) assisted systems under unknown channel state information (CSI) conditions. [Methods] System secrecy is enhanced by allocating residual power to artificial noise generation in legitimate users’ channel null spaces, subject to RIS reflection power minimization while guaranteeing user data rates. [Results] Under identical power constraints, the double-RIS system achieves a higher secrecy rate than its single-RIS counterpart for multiple users. [Conclusions] Simulation results demonstrate the superiority of the double-RIS system over its single-RIS counterpart in enhancing communication link security for multiple users, providing robust eavesdropping protection. This technology establishes a technical foundation for securing wireless communications in Chinese Smart Procuratorate Project.

Key words: double-reconfigurable intelligent surface, wireless communications, artificial noise, physical layer security, Smart Procuratorate Project

CHEN Xinwu,HAN Shuai. Secure Transmission Method for Multi-User Multi-Eavesdropper Systems Under Unknown CSI with Double-RIS[J]. Frontiers of Data and Computing, 2025, 7(6): 44-54, https://cstr.cn/32002.14.jfdc.CN10-1649/TP.2025.06.005.

Figures/Tables 5

Fig.1

Alg.1

The total algorithm for the problem (P1)"

算法1：未知CSI下基于双RIS的多用户多窃听者安全传输算法

初始化：反射系数矢量

θ 10

和

θ 20

；
设置：

r = 1

，迭代精度

ε 1

；
重复：
给定

θ 1 (r - 1)

和

θ 2 (r - 1)

，通过求解问题（P1.1.2找到最优解

w (r)

；
给定

w (r)

和

θ 2 (r - 1)

，通过求解问题（P1.2.2）找到最优解

θ 1 (r)

;
给定

w (r)

和

θ 1 (r)

，通过求解问题（P1.3.1）找到最优解

θ 2 (r)

;
更新

r = r + 1

；

直至（P1）的目标值达到收敛，或者两次迭代之间的差值小于设定的迭代精度为止。

Alg.1

Fig.2

Fig.3

Fig.4

References 13

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Secure Transmission Method for Multi-User Multi-Eavesdropper Systems Under Unknown CSI with Double-RIS

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