olemus
turvapoliitika ja turvaeesmärgi teostus
= the implementation of a security policy as well as a security objective

NIST SP 800-160 Vol. 2 Rev. 1:
The capability provided by the system or a system element. The capability may be expressed generally as a concept or specified precisely in requirements.

näiteid
https://www.igi-global.com/dictionary/security-function/26102

https://csrc.nist.gov/glossary/term/security_function

https://www.rfc-editor.org/rfc/pdfrfc/rfc8192.txt.pdf