AAA protocol

AAA (from the English. Authentication, Authorization, Accounting ) - a family of protocols used to describe the process of providing access and control over it.

• Authentication - the matching person (request) of an existing security account. It is carried out by login , password , certificate , smart card , etc.
• Authorization ( authorization , authorization check, access level check) - a mapping of an account in the system (and the authenticated person) and certain authorities (or denial of access). In general, authorization can be “negative” (User A is denied access to the company's servers ).
• Accounting (tracking) - tracking the consumption of resources (mainly network) by the user. Accounting also includes a record of access to the system ( access logs ).