In access control evaluation, what order ensures the most specific condition is evaluated first?

In access control evaluation, what order ensures the most specific condition is evaluated first?

• A. From most specific to most generic
• B. From most generic to most specific
• C. In alphabetical order
• D. Random order

Answer: (A)

The main idea is to apply the most precise condition first so specific cases aren’t overshadowed by broader rules. In access control, a rule that targets a narrow scenario—like a single user, a specific resource, or a particular time window—is more specific than a rule that covers a large group or many resources. If you evaluate general rules first, a broad grant or denial could apply before any specific exception is checked, leading to unintended access decisions. By evaluating from most specific to most generic, the system ensures that precise restrictions or allowances are enforced first, and only if no specific rule applies does it fall back to looser, broader rules. For example, a rule that denies access to a particular user to a specific document should take precedence over a general rule that permits access to all users to that document during business hours.

The main idea is to apply the most precise condition first so specific cases aren’t overshadowed by broader rules. In access control, a rule that targets a narrow scenario—like a single user, a specific resource, or a particular time window—is more specific than a rule that covers a large group or many resources. If you evaluate general rules first, a broad grant or denial could apply before any specific exception is checked, leading to unintended access decisions. By evaluating from most specific to most generic, the system ensures that precise restrictions or allowances are enforced first, and only if no specific rule applies does it fall back to looser, broader rules. For example, a rule that denies access to a particular user to a specific document should take precedence over a general rule that permits access to all users to that document during business hours.