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Key Generation Method Based on Multi-Satellite Cooperation and Random Perturbation.

Yinuo Hao1, Pengcheng Mu2, Huiming Wang2

  • 1Wireless Communication Technology Office, Information Engineering University, Zhengzhou 450002, China.

Entropy (Basel, Switzerland)
|December 24, 2021
PubMed
Summary

This study introduces a novel physical layer key generation method for low-earth-orbit satellite communications. It enhances security by using multi-satellite cooperation and random perturbations to prevent channel state information leakage.

Keywords:
LEO satellite-to-ground communicationkey generationphysical layer security

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Area of Science:

  • Satellite Communications
  • Physical Layer Security
  • Cryptography

Background:

  • Low-earth-orbit (LEO) satellite-to-ground communication faces challenges with limited antenna size and predictable satellite trajectories.
  • Predictable trajectories in LEO satellite systems can lead to the leakage of channel state information (CSI), compromising physical layer key generation.

Purpose of the Study:

  • To develop a secure and feasible physical layer key generation method for LEO satellite-to-ground communication.
  • To address the vulnerability of CSI leakage due to limited antenna size and predictable satellite motion.

Main Methods:

  • Proposes a key generation method utilizing multi-satellite cooperation to increase equivalent antenna aperture.
  • Introduces a random perturbation factor based on satellite motion characteristics to enhance channel randomness.
  • Employs multi-satellite cooperation to reduce correlation between legal and wiretap channels.

Main Results:

  • The proposed method effectively minimizes the leakage of the legal channel's CSI.
  • Simulation results validate the security and feasibility of the key generation technique in LEO satellite scenarios.
  • Demonstrates improved security against eavesdropping in satellite communication links.

Conclusions:

  • The multi-satellite cooperation and random perturbation method offers a robust solution for secure physical layer key generation in LEO satellite communications.
  • This approach enhances the security of satellite communication systems by mitigating CSI leakage vulnerabilities.
  • The method is proven safe and practical for LEO satellite-to-ground communication environments.