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We consider the problem of covert communication over a state-dependent channel, where the transmitter has noncausal knowledge of the channel states. Here, "covert" means that the probability that a warden on the channel can detect the communication must be small. In contrast with traditional models without noncausal channel-state information at the transmitter, we show that covert communication can be possible with positive rate. We derive closed-form formulas for the maximum achievable covertdoi:10.1109/isit.2017.8007046 dblp:conf/isit/LeeWKW17 fatcat:52btocvdjfgzdaopwc3cpw3xqa