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Usage of randomness (i.e. non-predictable data, usually in the form of bits or numbers) for cryptographic purposes.
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Better lower bound on min-entropy
In “Randomness Condensers for Efficiently Samplable,
Seed-Dependent Sources” by Dodis, Ristenpart, and Vadhan (PDF), I have seen the statement that:
any tuple of distributions $(X,Z)$ is $\varepsilon …