Covert Communication with Cognitive Jammer Embedded in Public Communication System.

Area of Science:

• Wireless communication security
• Information theory
• Signal processing

Background:

• Covert communication is essential for secure data transmission.
• Cognitive jammers (CJ) offer potential for enhancing covertness in wireless networks.
• Existing methods lack optimal strategies for integrating covertness with public transmissions.

Purpose of the Study:

• To investigate the effectiveness of a cognitive jammer (CJ) in a public communication system for covert communication.
• To analyze the impact of CJ on detection error probability (DEP) and average covert rate (ACR).
• To compare the proposed CJ-assisted scheme against baseline scenarios (uninformed jammer, no jammer).

Main Methods:

• Derivation of detection error probability (DEP) for both CJ and warden.
• Calculation of average covert rate (ACR).
• Performance analysis under varying public transmission rates and CJ detection accuracy.

Main Results:

• The CJ-assisted scheme significantly outperforms schemes with uninformed jammers or no jammer in terms of covertness.
• High public transmission rates can negatively impact covertness.
• Enhanced CJ detection accuracy improves both covertness and ACR.

Conclusions:

• Cognitive jammers are effective tools for enhancing covert communication within public systems.
• Optimizing CJ detection accuracy is crucial for maximizing covertness and data rates.
• The study provides a framework for designing more secure covert communication systems.