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What is the "single-letter characterization of the secrecy capacity"?

I'm reading a paper [1] in which secrecy capacity are being discussed under the following terms: A single-letter characterization of the secrecy capacity that holds for the general case remains ...
Nino Filiu's user avatar
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What is Perfect forward secrecy?

I have read that when a user contacts an entity like a bank, it creates a pre-master key and then selects a master key for subsequent communications. Can the lack of PFS, create a security flaw if ...
PDHide's user avatar
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