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Used to indicate that data X is an optional input to the key derivation function.
NIST SP 800-108
Indicates that the inclusion of X is optional.
NIST SP 800-56B Rev. 2
NIST SP 800-56B Rev. 1
Comments about specific definitions should be sent to the authors of the linked Source publication. For NIST publications, an email is usually found within the document.
Comments about the glossary's presentation and functionality should be sent to firstname.lastname@example.org.
See NISTIR 7298 Rev. 3 for additional details.