  The coding problem for wiretap channels with causal channel state information
(CSI) available at the encoder (Alice) and/or the decoder (Bob) is studied. We
are concerned here particularily with the problem of achievable secret-message
secret-key rate pairs under the semantic security criterion. Our main result
extends all the previous results on achievable rates as given by Chia and El
Gamal [10], Fujita [11], and Han and Sasaki [23]. In order to do this, we first
derive a unifying theorem (Theorem 2) with causal CSI at Alice, which follows
immediately by leveraging the unifying seminal theorem for wiretap channels
with non-causal CSI at Alice as recently established by Bunin et al. [22]. The
only thing to do here is just to re-interpret the latter non-causal one in a
causal manner. A prominent feature of this approach is that we are able to
dispense with the block-Markov encoding scheme as used in the previous works.
Also, the exact secret-message key capacity region for wiretap channels with
non-causal CSI at both Alice and Bob is given.
