  In this paper, we consider the secrecy capacity of a wiretap channel in the
presence of causal state information and secure rate-limited feedback. In this
scenario, the causal state information from the channel is available to both
the legitimate transmitter and legitimate receiver. In addition, the legitimate
receiver can send secure feedback to the transmitter at a limited rate Rf . We
shown that the secrecy capacity is bounded. Moreover, when the channel to the
legitimate receiver is less noisy than the channel to the eavesdropper, the
bound is shown to be tight. The capacity achieving scheme is based on both the
Wyner wiretap coding and two steps of shared-key generation: one from the state
information and one via the noiseless feedback. Finally, we consider several
special cases. When state information is available only at the legitimate
receiver, the analysis suggests that unlike previous results involving
feedback, it is better to use the feedback to send the state information to the
transmitter (when possible), rather than send a random key.
