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In this paper, inner and outer bounds on the capacity region of two-user interference channels with two confidential messages have been proposed. By adding secure multiplex coding to the error correction method, which achieves the best achievable capacity region for interference channel up to now, the authors have shown that the improved secure capacity region compared with now is the whole Han-Kobayashi region. In addition, this construction not only removes the rate loss incurred by adding dummy messages to achieve security, but also change the original weak security condition to strong security.
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