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Randomness is a way to mathematically model uncertainty. We often assume to have access to some well-defined source of random numbers, or that input values or events follow some probability distribution.

19 votes
5 answers
8k views

How can it be detected that a number generator is not really random?

I heard that random number generation in computers isn't really random, but there is no efficient algorithm to detect it. How can it be detected at all ?