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Randomness extraction


  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.
NIST SP 800-133 Rev. 2

  The first step in the key derivation procedure specified in this Recommendation, which produces a key derivation key from a shared secret.
NIST SP 800-56C [Superseded]