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random number generator (RNG)


  A process that is invoked to generate a random sequence of values (usually a sequence of bits) or an individual random value.
CNSSI 4009-2015 from IETF RFC 4949 Ver 2

  A mechanism that purports to generate truly random data.
NIST SP 800-22 Rev. 1a under Random Number Generator (RNG)

  A process used to generate an unpredictable series of numbers. Also called a Random bit generator (RBG).
NIST SP 800-57 Part 1 Rev. 5 under Random number generator (RNG)