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What is the difference between DAC, MAC, and RBAC?
ModelWho controls accessTypical use case
DACThe resource ownerFile permissions on a personal workstation
MACA central security policy enforced by the OSMilitary and government classified systems
RBACPredefined organizational rolesEnterprise applications like HR or ERP systems

DAC gives the most flexibility but the weakest guarantees, since any user can grant access to their own files. MAC gives the strongest guarantees because users can't override the policy, at the cost of flexibility. RBAC sits in between, mapping permissions to job roles so access scales with the organization rather than with individual decisions.

Which model is enforced by a central, non-overridable policy?
Which model maps permissions to organizational job roles?

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