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A context-unique value—a value unique within a specific context—that is associated with a device (for example, a string consisting of a network address).
NIST SP 800-213 from NIST SP 800-56A Rev. 3 - Adapted
NISTIR 8259A from NIST SP 800-56A Rev. 3 - Derived
NISTIR 8259B from ETSI EN 303 645 v2.1.0 - Adapted