|Treating Interference as Noise is Optimal for Covert Communication over Interference Channels
|Kang-Hee Cho, Si-Hyeon Lee, Korea Advanced Institute of Science and Technology, Korea (South)
|P.1: Covert Communications
|Cryptography, Security and Privacy
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|In this paper, the covert communication scenario over $K$-user-pair discrete memoryless interference channels with a warden is studied. We assume that the warden’s channel output distribution induced by $K$ ``off” input symbols, which are sent when no communication occurs, is not a convex combination of those induced by any other combination of input symbols (otherwise, the square-root law does not hold). We derive the exact covert capacity region and show that a simple point-to-point based scheme with treating interference as noise is optimal. In addition, we analyze the secret key length required for the reliable and covert communication with the desired rates, and present a channel condition where the secret key between each user pair is unnecessary.