Primary definition
A domain that implements a security policy and is administered by a single authority. Source: CNSSP No. 24; CNSSI No. 1253F Attachment 3
Also known assecurity realm · protected domain · trust domain
2 sources cited4 related termsReviewed Aug 10, 2026
— Committee on National Security Systems Glossary CNSSI 4009-2015View source
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CNSSGC
A domain that implements a security policy and is administered by a single authority. Source: CNSSP No. 24; CNSSI No. 1253F Attachment 3
Committee on National Security Systems Glossary CNSSI 4009-2015 · 2024
Cite this term
Permanent URL · stable across revisions
Election Security Glossary. (2026). Security Domain. In Election Security Glossary. Retrieved August 21, 2026, from https://electionsecurityglossary.com/glossary/security-domain
Sources
2 cited · last checked Aug 10, 2026
01
Committee on National Security Systems Glossary CNSSI 4009-2015
Committee on National Security Systems Glossary CNSSI 4009-2015
High consensus
02
The Cyber Glossary
The Cyber Glossary
Disputed
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