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See Cryptographic key component.
NIST SP 800-57 Part 1 Rev. 4
NIST SP 800-57 Part 1 Rev. 3 [Superseded]
One of at least two parameters that have the same security properties (e.g., randomness) as a cryptographic key; parameters are combined using an approved cryptographic function to form a plaintext cryptographic key before use.
NIST SP 800-57 Part 2 Rev.1