olemus
Wiktionary:
4. a security mechanism, policy, or procedure that can counter system attack, reduce risks, and resolve vulnerabilities; a safeguard or countermeasure
ISO Guide 73, ISO 22300, ISO/IEC 27000:
igasugune abinõu riski muutmiseks: protsess, poliitika, vahend, tava, muu toiming
= measure that is modifying risk
Note 1. Controls include any process, policy, device, practice, or other actions which modify risk.

liigid
technical -- tehniline
administrative -- halduslik
organizational -- korralduslik
physical - füüsiline
regulatory -- õiguslik

ülevaateid
https://en.wikipedia.org/wiki/Security_controls
https://scadahacker.com/library/Documents/Best_Practices/CoCS%20-%2020%20Critical%20Security%20Controls%20-%20Ver%205.1.pdf
https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-53r5.pdf

vt ka
- füüsilised turvameetmed
- lisa-turvameede
- rakenduse turvameede
- tehnilised turvameetmed
- turvameetme eesmärk
- turvamehhanism