to name a few.
* A cryptographically secure hash might also be a base of a good CSPRNG, using, for example, a construct that NIST calls Hash DRBG.
* An HMAC primitive can be used as a base of a CSPRNG, for example, as part of the construct that NIST calls HMAC DRBG.

Number-theoretic designs

* The Blum Blum Shub algorithm has

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