Attribute-Based Access Control (ABAC) is considered a dynamic authorization model because access decisions are made in real time based on attributes of the user, resource, action, and environment. These attributes can include time of day, device type, location, data sensitivity, and user role.
Unlike RBAC or MAC, which rely on static roles or labels, ABAC evaluates policies dynamically using a policy decision point (PDP). This makes ABAC ideal for modern cloud, zero trust, and highly distributed environments.
DAC allows owners to grant permissions, RBAC uses predefined roles, and MAC relies on fixed security labels. ABAC provides the most flexible and context-aware authorization.
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