Visible to the public Keyless Covert Communication in the Presence of Channel State Information

TitleKeyless Covert Communication in the Presence of Channel State Information
Publication TypeConference Paper
Year of Publication2020
AuthorsZivariFard, H., Bloch, M., Nosratinia, A.
Conference Name2020 IEEE International Symposium on Information Theory (ISIT)
Date Publishedjun
Keywordschannel capacity, channel coding, channel output, channel state information, compositionality, covert capacity, covert channels, innocent channel-input symbol, keyless covert communication, pubcrawl, resilience, Resiliency, Scalability, telecommunication security, transmitter, wireless channels
AbstractWe consider the problem of covert communication when Channel State Information (CSI) is available non-causally, causally, and strictly causally at both transmitter and receiver, as well as the case when channel state information is only available at the transmitter. Covert communication with respect to an adversary referred to as the "warden", is one in which the distribution induced during communication at the channel output observed by the warden is identical to the output distribution conditioned on an innocent channel-input symbol. In contrast to previous work, we do not assume the availability of a shared key at the transmitter and legitimate receiver; instead shared randomness is extracted from the channel state, in a manner that keeps it secret from the warden despite the influence of the channel state on the warden's output. When CSI is available at both transmitter and receiver, we derive the covert capacity region; when CSI is only available at the transmitter, we derive inner and outer bounds on the covert capacity. We also derive the covert capacity when the warden's channel is less noisy with respect to the legitimate receiver. We provide examples for which covert capacity is zero without channel state information, but is positive in the presence of channel state information.
Citation Keyzivarifard_keyless_2020