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Entropy Source

Definitions:

  A physical source of information whose output either appears to be random in itself or by applying some filtering/distillation process. This output is used as input to either a RNG or PRNG.
Sources:
NIST SP 800-22 Rev. 1a

  A combination of a noise source (e.g., thermal noise or hard drive seek times), health tests, and an optional conditioning component. The entropy source produces random bitstrings to be used by an RBG.
Sources:
NIST SP 800-90A Rev. 1

  The combination of a noise source, health tests, and an optional conditioning component that produce random bitstrings to be used by an RBG.
Sources:
NIST SP 800-90B under Entropy source

  The combination of a noise source, health tests, and optional conditioning component that produce bitstrings containing entropy.
Sources:
NIST IR 8427