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In cryptography, a pseudorandom ensemble is a family of variables meeting the following criteria:

Let be a uniform ensemble
and be an ensemble. The ensemble is called **pseudorandom** if and
are indistinguishable in polynomial time.

- 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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