  The secrecy problem in the state-dependent cognitive interference channel is
considered in this paper. In our model, there are a primary and a secondary
(cognitive) transmitter-receiver pairs, in which the cognitive transmitter has
the message of the primary one as side information. In addition, the channel is
affected by a channel state sequence which is estimated partially at the
cognitive transmitter and the corresponding receiver. The cognitive transmitter
wishes to cooperate with the primary one, and it sends its individual message
which should be confidential at the primary receiver. The achievable
equivocation-rate regions for this channel are derived using two approaches:
the binning scheme coding, and superposition coding. Then the outer bounds on
the capacity are proposed and the results are extended to the Gaussian
examples.
