The paper gives necessary and sufficient conditions for secure variable-length source encryption under mutual information leakage bounded by any δ>0, proves these conditions are independent of δ (strong converse), and shows existence of universal encryption schemes for any source and key statistics.
Strong converse for distributed source encryption under standard mutual information,
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A Framework of Variable-Length Source Encryption using Mutual Information Security Criterion: Universal Coding, Strong Converse Theorem
The paper gives necessary and sufficient conditions for secure variable-length source encryption under mutual information leakage bounded by any δ>0, proves these conditions are independent of δ (strong converse), and shows existence of universal encryption schemes for any source and key statistics.