For symmetric BIDMCs the paper identifies every minimum-error-probability degradation, states a necessary condition for maximum symmetric-capacity degradations, and gives an efficient algorithm to find capacity-maximizing schemes.
Channel upgrading for semantically-secure en- cryption on wiretap channels
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On the degradations of Binary-Input Discrete Memoryless Channels
For symmetric BIDMCs the paper identifies every minimum-error-probability degradation, states a necessary condition for maximum symmetric-capacity degradations, and gives an efficient algorithm to find capacity-maximizing schemes.