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We propose a covert communication protocol for the spread-spectrum multiplerandom access with additive white Gaussian noise (AWGN) channel. No existingpaper has studied covert communication for the random access channel. Ourprotocol assumes binary discrete phase-shift keying (BPSK) modulation, and itworks well under imperfect channel state information (I-CSI) for both thelegitimate and adversary receivers, which is a realistic assumption in the lowpower regime. Also, our method assumes that the legitimate users share secretvariables in a similar way as the preceding studies. Although several studiesinvestigated the covert communication for the point-to-point communication, noexisting paper considers the covert communication under the above uncertaintyassumption even for point-to-point communication. Our protocol under the aboveuncertainty assumption allows O(n) legitimate senders and O(n/log n) activelegitimate senders. Furthermore, our protocol can be converted to a protocolfor point-to-point communication that works under the above uncertaintyassumption.

Covert communication with Gaussian noise: from random access channel to point-to-point channel