A security domain is
[a] set of users, rules, processes, systems, and services whose behavior and interactions are governed by a common security policy. A domain that implements a security policy and is administered by a single authority.
[w]ithin an information system, the set of objects that is accessible. Access is determined by the controls associated with information properties such as its security classification, security compartment, or sensitivity. The controls are applied both within an Information System (IS) and in its connection to other classified or unclassified Information Systems.
- FIPS 188, §3.2.
- CNSSI 4009, at 65.
- Glossary of Security Terms, Definitions, and Acronyms, at 216-17.