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Secure transmission of confidential messages is a critical issue in communication systems and especially in wireless systems due to the broadcast nature of wireless transmissions. In, Wyner addressed the transmission security from an information-theoretic point of view, and identified the rate-equivocation region and established the secrecy capacity of the discrete memoryless wiretap channel in which the wiretapper receives a degraded version of the signal observed by the legitimate receiver. The secrecy capacity is defined as the maximum communication rate from the transmitter to the legitimate receiver, which can be achieved while keeping the eavesdropper completely ignorant of the transmitted messages.
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