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The authors investigate the fundamental secrecy limits of arbitrary wiretap channels using the information-spectrum approach and they provide a random coding theorem for the secrecy capacity under various secrecy metrics. They show how their result specializes to several recent results, e.g., compound channels, parallel channels, and fading channels. As a side benefit, their analysis shows that earlier results hold under more stringent secrecy metrics than previously established. Although cryptography is traditionally handled at the application layer without regard to the imperfections of the lower layers, many contributions support the idea that the inherent noise of communication channels can be exploited for security.
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