5 research outputs found
Non-Adaptive Coding for Two-Way Wiretap Channel with or without Cost Constraints
This paper studies the secrecy results for the two-way wiretap channel
(TW-WC) with an external eavesdropper under a strong secrecy metric. Employing
non-adaptive coding, we analyze the information leakage and the decoding error
probability, and derive inner bounds on the secrecy capacity regions for the
TW-WC under strong joint and individual secrecy constraints. For the TW-WC
without cost constraint, both the secrecy and error exponents could be
characterized by the conditional R\'enyi mutual information in a concise and
compact form. And, some special cases secrecy capacity region and sum-rate
capacity results are established, demonstrating that adaption is useless in
some cases or the maximum sum-rate that could be achieved by non-adaptive
coding. For the TW-WC with cost constraint, we consider the peak cost
constraint and extend our secrecy results by using the constant composition
codes. Accordingly, we characterize both the secrecy and error exponents by a
modification of R\'enyi mutual information, which yields inner bounds on the
secrecy capacity regions for the general discrete memoryless TW-WC with cost
constraint. Our method works even when a pre-noisy processing is employed based
on a conditional distribution in the encoder and can be easily extended to
other multi-user communication scenarios