Security Label

A mechanism for binding a set of security attributes — such as classification level, handling caveats, or access-control constraints — directly to an information object or data structure, so that those attributes travel with the object and can be evaluated by any system or protocol that processes it. It is formally defined as "the means used to associate a set of security attributes with a specific information object as part of the data structure for that object" (NIST CSRC Glossary, sourced from CNSSI 4009-2015 and NIST SP 800-12/800-53). Security labels convey information used by protocol entities to determine how to handle data communicated between open systems, and can be used to control access, specify protective measures, and determine handling restrictions required by a communications security policy. In practice, the term encompasses security labeling of both data objects and system subjects — internal data structures within information systems — to enable system-based enforcement of information security policies.

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