Subject, object, operation and permission

From Erights

From a security point of view, we recognize:

• subjects
• objects

Subjects are active entities (e.g. UNIX processes) with some behavior. Subjects can designate objects and try to perform some supported operations with them.

What kind of operations can be performed with an object depends on its type.

In general, the set of existing objects and subjects changes over time.

Permissions is a relation (among subjects, objects and their operations) that defines which operations of what objects are permitted for particular subjects.