Applications
Randomness extractors are used widely in cryptographic applications, whereby a cryptographic hash function is applied to a high-entropy, but non-uniform source, such as disk drive timing information or keyboard delays, to yield a uniformly random result.
Randomness extractors have played a part in recent developments in quantum cryptography, where photons are used by the randomness extractor to generate secure random bits.
Randomness extraction is also used in some branches of computational complexity theory.
Random extraction is also used to convert data to a simple random sample, which is normally distributed, and independent, which is desired by statistics.
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