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An access control service
|“||[is a] security service that protects against a system entity using a system resource in a way not authorized by the system's security policy.||”|
|“||provides means to ensure that resources are accessed by subjects only in an authorized manner. Resources concerned may be the physical system, the system software, applications and data. ||”|
"The access control service can be defined and implemented at different levels of granularity in the TMN: at agent level, object level or attribute level. The limitations of access are laid out in access control information: the means to determine which entities are authorized to have access; what kind of access is allowed (reading, writing, modifying, creating, deleting).