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### pseudorandom number generator

Abbreviations / Acronyms / Synonyms:

Deterministic random bit generator (DRBG)

Definitions:

A deterministic computational process that has one or more inputs called "seeds", and it outputs a sequence of values that appears to be random according to specified statistical tests. A cryptographic PRNG has the additional property that the output is unpredictable, given that the seed is not known.
Sources:
CNSSI 4009-2015 from IETF RFC 4949 Ver 2 - Adapted

A deterministic algorithm which, given a truly random binary sequence of length k, outputs a binary sequence of length l >> k which appears to be random. The input to the generator is called the seed, while the output is called a pseudorandom bit sequence.
Sources:
NIST SP 800-22 Rev. 1a under Pseudorandom Number Generator (PRNG)

See Deterministic random bit generator (DRBG).
Sources:
NIST SP 800-57 Part 1 Rev. 5 under Pseudorandom number generator (PRNG)

See Deterministic Random Bit Generator.
Sources:
NIST SP 800-90A Rev. 1 under Pseudorandom Number Generator

A random bit generator that includes a DRBG algorithm and (at least initially) has access to a source of randomness. The DRBG produces a sequence of bits from a secret initial value called a seed. A cryptographic DRBG has the additional property that the output is unpredictable given that the seed is not known. A DRBG is sometimes also called a pseudo-random number generator (PRNG) or a deterministic random number generator.
Sources:
NIST SP 800-57 Part 1 Rev. 5 under Deterministic random bit generator (DRBG)

An RBG that includes a DRBG mechanism and (at least initially) has access to a randomness source. The DRBG produces a sequence of bits from a secret initial value called a seed, along with other possible inputs. A DRBG is often called a Pseudorandom Number (or Bit) Generator. Contrast with NRBG.
Sources:
NIST SP 800-90A Rev. 1 under Deterministic Random Bit Generator

An RBG that includes a DRBG mechanism and (at least initially) has access to a source of entropy input. The DRBG produces a sequence of bits from a secret initial value called a seed, along with other possible inputs. A DRBG is often called a Pseudorandom Number (or Bit) Generator.
Sources:
NIST SP 800-90B under Deterministic Random Bit Generator