✅Security
: keeping unauthorized entities from doing things you don’t want them to do
: protecting systems from deliberate attacks
- Confidentiality, Integrity, Availability
OS의 역할
privileged mode, memory protection, file access permissions, ...
✅Protection
: protecting files and other resources from accidental misuse
✅Authentication
: proving that someone is who they say they are
✅Authorization
: Verify whether the authenticated user has an access privilege to the system resource.
ACL(Access control list)
: implements file permission.
- read protection: provide confidentiality
- write protection: provide integrity
