Which access control model uses security labels to determine authorized users for accessing resources?

The access control model that utilizes security labels to determine which users are authorized to access certain resources is Mandatory Access Control (MAC). In MAC, access rights are assigned based on a system of security labels that classify both the resources and users' clearances. This means that the system enforces strict policies regarding access based on predefined security levels, such as confidential, secret, and top secret, which are typical in government and military environments.

Users cannot change permissions or access rights; instead, the security labels dictate what users can access based on their clearance level. This model is especially suited for environments where data classification and extensive control over access levels are necessary, providing strong safeguards against unauthorized access.