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Disguised Full-Duplex Covert Communications.

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Summary
This summary is machine-generated.

This study introduces a novel covert communication method where a full-duplex node acts as a seemingly receive-only device to transmit secret messages. Optimizing transmit power enhances covert rates, offering a new security approach.

Keywords:
covert communicationscovert ratedetection error probabilityfull duplexlow probability of detectionphysical layer security

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Area of Science:

  • Information Theory
  • Wireless Communications
  • Network Security

Background:

  • Covert communication enhances security beyond cryptography and physical layer methods.
  • Existing methods aim to hide the existence of communication links.
  • This research explores advanced covertness by disguising node functionality.

Purpose of the Study:

  • To analyze a system where a full-duplex node covertly transmits messages to a hidden receiver.
  • To determine the achievable covert rate by optimizing public data rate and transmit power.
  • To evade warden surveillance by minimizing detection error probability.

Main Methods:

  • Mathematical modeling of a covert communication system with a full-duplex destination node.
  • Optimization of destination node's public data rate and transmit power.
  • Analysis of worst-case detection error probability (DEP) for warden surveillance.

Main Results:

  • Closed-form solutions for achievable covert rate are derived.
  • Numerical results demonstrate the impact of system parameters on covert rate.
  • Destination transmit power inversely affects covert rate based on source transmit power levels.

Conclusions:

  • The study provides an information-theoretic performance guideline for advanced covert communication.
  • Future research directions include practical modulation schemes and imperfect channel state information analysis.
  • The proposed method offers enhanced covertness by node functional disguise.