olemus
ISO/IEC 27033:
üldotstarbeline (näiteks Linux) või
kohandatud operatsioonisüsteem, mis
on konfigureeritud või kavandatud
minimeerima rikkumise või ründe võimalust
=
operating system which has been configured or designed specifically to minimize the potential for comprise or attack
Note.: This may be a general OS, such as Linux, which has been configured for this environment or may be a more custom built solution

ülevaateid
https://securityboulevard.com/2020/07/web-system-hardening-in-5-easy-steps/

https://robiulislam.wordpress.com/2011/12/28/hardening-linux-os/

https://danmackinlay.name/notebook/hardened_os.html

https://techlog360.com/secure-linux-distributions-privacy-protection/

https://www.scip.ch/en/?labs.20200611

https://github.com/trimstray/the-practical-linux-hardening-guide

https://github.com/decalage2/awesome-security-hardening

https://madaidans-insecurities.github.io/guides/linux-hardening.html