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Key expansion

Definitions:

  The second step in the key-derivation procedure in which a key-derivation key is used to derive secret keying material having the desired length(s). The first step in the procedure is randomness extraction.
Sources:
NIST SP 800-133 Rev. 2

  The second step in the key-derivation procedure specified in this Recommendation in which a key-derivation key is used to derive secret keying material having the desired length.
Sources:
NIST SP 800-56C Rev. 2