A security filter is
|“||[a] set of software or firmware routines and techniques employed in a computer system to prevent automatic forwarding of specified data over unprotected links or to unauthorized persons.||”|
|“||[a] trusted subsystem that enforces a security policy on the data that pass through it.||”|
- Auditing and Financial Management: Glossary of EDP Terminology, at 15.
- Department of Defense, National Computer Security Center, Glossary of Computer Security Terms (NCSC-TG-004, Ver. 1) (Oct. 21, 1988).