Information-Theoretic Security

On Optimal Information-Theoretic Security in Symmetric Encryption under Low-Entropy Keys
We characterize optimal key and message confidentiality under low-entropy keys and construct a distribution-aware encryption scheme that attains the optimal message-recovery bound.
Haibo Cheng, Haijie Su, Dongyi Li, Wenting Li, Ping Wang
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On Optimal Information-Theoretic Security in Symmetric Encryption under Low-Entropy Keys