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Randomness extraction

Definition(s):

  The first step in the two-step key-derivation procedure during which a key-derivation key is produced. The second step in the procedure is key expansion.
Source(s):
NIST SP 800-133 Rev. 2

  The first step in the two-step key-derivation procedure specified in this Recommendation; during this step, a key-derivation key is produced from a shared secret.
Source(s):
NIST SP 800-56C Rev. 2