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A Novel Approach to Secure RSMA Networks

Shaima Abidrabbu, Hüseyin Arslan

TL;DR

This work tackles security vulnerabilities of RSMA by introducing a data-dependent interleaving mechanism that binds the common stream to each user’s private data. The transmitter interleaves the common bits using a pattern generated from private bits, enabling the legitimate receiver to reconstruct and de-interleave via its own private data, while an eavesdropper cannot deduce the dynamic permutation. A selective bit-interleaving strategy and Gray-mapped interleavers are proposed to balance security and system efficiency, with a complexity-based argument showing low decoding complexity for legitimate users and high complexity for adversaries. BER-based performance analysis and simulation results indicate greater resilience to internal and external eavesdropping without compromising RSMA’s spectral efficiency. The approach offers a practical, optimization-free path to secure RSMA deployments, with future work aimed at adaptive bit-selection to tailor secrecy levels to user requirements.

Abstract

This letter introduces a novel data-dependent interleaving technique designed to enhance the security of rate-splitting multiple access (RSMA) networks by protecting the common stream from eavesdropping threats. Specifically, we exploit the RSMA structure by interleaving the common bits of each user based on a sequence derived from their private bits. By decoding its private stream, the legitimate receiver reconstructs the interleaving sequence set by the transmitter and successfully de-interleaves the common stream. Therefore, the common part is successfully prevented from being intercepted by an eavesdropper who is unable to deduce the dynamic changing interleaving permutations. To ensure dynamic interleaving sequences, a private bit selection approach that balances the trade-off between security and system efficiency is proposed. Simulation findings confirm the effectiveness of the suggested method, showing notable security improvements while maintaining robust overall system reliability.

A Novel Approach to Secure RSMA Networks

TL;DR

This work tackles security vulnerabilities of RSMA by introducing a data-dependent interleaving mechanism that binds the common stream to each user’s private data. The transmitter interleaves the common bits using a pattern generated from private bits, enabling the legitimate receiver to reconstruct and de-interleave via its own private data, while an eavesdropper cannot deduce the dynamic permutation. A selective bit-interleaving strategy and Gray-mapped interleavers are proposed to balance security and system efficiency, with a complexity-based argument showing low decoding complexity for legitimate users and high complexity for adversaries. BER-based performance analysis and simulation results indicate greater resilience to internal and external eavesdropping without compromising RSMA’s spectral efficiency. The approach offers a practical, optimization-free path to secure RSMA deployments, with future work aimed at adaptive bit-selection to tailor secrecy levels to user requirements.

Abstract

This letter introduces a novel data-dependent interleaving technique designed to enhance the security of rate-splitting multiple access (RSMA) networks by protecting the common stream from eavesdropping threats. Specifically, we exploit the RSMA structure by interleaving the common bits of each user based on a sequence derived from their private bits. By decoding its private stream, the legitimate receiver reconstructs the interleaving sequence set by the transmitter and successfully de-interleaves the common stream. Therefore, the common part is successfully prevented from being intercepted by an eavesdropper who is unable to deduce the dynamic changing interleaving permutations. To ensure dynamic interleaving sequences, a private bit selection approach that balances the trade-off between security and system efficiency is proposed. Simulation findings confirm the effectiveness of the suggested method, showing notable security improvements while maintaining robust overall system reliability.

Paper Structure

This paper contains 10 sections, 14 equations, 2 figures, 1 table, 1 algorithm.

Table of Contents

  1. Introduction
  2. SYSTEM MODEL
  3. THE PROPOSED SECURE RSMA APPROACH
  4. Definition of the Proposed Approach
  5. Addressing Bit Selection
  6. Resistance to Brute-Force Attacks
  7. Interleaving Permutation Pattern
  8. PERFORMANCE EVALUATION
  9. SIMULATION RESULTS
  10. CONCLUSION AND FUTURE WORK

Figures (2)

  • Figure 1: Proposed system model from transmitter and receiver perspectives.
  • Figure 2: BER evaluation: (a) the proposed secure RSMA approach, and (b) the proposed secure RSMA with and without the side information $\zeta$.