Pseudorandom ensemble

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Let $U=\{U_{n}\}_{{n\in {\mathbb {N}}}}$ be a uniform ensemble and $X=\{X_{n}\}_{{n\in {\mathbb {N}}}}$ be an ensemble. The ensemble $X$ is called pseudorandom if $X$ and $U$ are indistinguishable in polynomial time.

References

Goldreich, Oded (2001). Foundations of Cryptography: Volume 1, Basic Tools. Cambridge University Press. ISBN 0-521-79172-3. Fragments available at the author's web site.

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