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In this paper, inner and outer bounds on the capacity region of two-userinterference channels with two confidential messages have been proposed. Byadding secure multiplex coding to the error correction method in [15] whichachieves the best achievable capacity region for interference channel up tonow, we have shown that the improved secure capacity region compared with [2]now is the whole Han-Kobayashi region. In addition, this construction not onlyremoves the rate loss incurred by adding dummy messages to achieve security,but also change the original weak security condition in [2] to strong security.Then the equivocation rate for a collection of secret messages has also beenevaluated, when the length of the message is finite or the information rate ishigh, our result provides a good approximation for bounding the worst caseequivocation rate. Our results can be readily extended to the Gaussianinterference channel with little efforts.

Secure Multiplex Coding Over Interference Channel with Confidential Messages