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Relay Selection for Covert Communication with an Active Warden.

Jong Yeol Ryu1, Jung Hoon Lee2

  • 1Department of AI Information Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea.

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|July 12, 2025
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Summary
This summary is machine-generated.

This study introduces a relay selection strategy to enhance covert communication security against an active warden. By choosing relays with minimal warden channel gain, covert rates are improved, and warden threats are reduced.

Keywords:
active wardencovert communicationcovert rate maximizationpower allocationrelay selection

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Area of Science:

  • Information Security
  • Wireless Communication
  • Signal Processing

Background:

  • Covert communication systems face threats from active wardens who jam and detect transmissions.
  • The relay-to-warden channel is critical for warden jamming and detection in multi-relay systems.

Purpose of the Study:

  • To propose and analyze a relay selection scheme to mitigate active warden threats in covert communication.
  • To enhance covert communication security and maximize covert rates.

Main Methods:

  • A novel relay selection scheme is proposed, prioritizing relays with minimum channel gain to the warden.
  • Performance analysis using analytical methods and numerical simulations.

Main Results:

  • The proposed scheme effectively minimizes the threat from an active warden.
  • Increasing the number of relays improves system performance.
  • Analytical predictions closely align with simulation results.

Conclusions:

  • The developed relay selection scheme enhances covert communication security against active wardens.
  • The strategy offers a viable method for improving covert rates in multi-relay systems.