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Historically, access control models have included [[mandatory access control]] (MAC), [[discretionary access control]] (DAC), and more recently [[role-based access control]] (RBAC). These access control models are user-centric and do not take into account additional parameters such as resource information, the relationship between the user (the requesting entity) and the resource, and dynamic information, e.g. time of the day or user IP.
ABAC tries to address this by defining access control based on attributes which describe the requesting entity (the user), the targeted object or resource, the desired action (view, edit, delete), and environmental or contextual information. This is why access control is said to be attribute-based.
== Implementations==
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