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Access control is a way of limiting access to a system or to physical or virtual resources. In computing, access control is a process by which users are granted access and certain privileges to systems, resources or information.
In access control systems, users must present credentials before they can be granted access. In physical systems, these credentials may come in many forms, but credentials that can't be transferred provide the most security.
For example, a key card may act as an access control and grant the bearer access to a classified area. Because this credential can be transferred or even stolen, it is not a secure way of handling access control.
A more secure method for access control involves two-factor authentication. The person who desires access must show credentials and a second factor to corroborate identity. The second factor could be an access code, a PIN or even a biometric reading.
There are three factors that can be used for authentication:
For computer security, access control includes the authorization, authentication and audit of the entity trying to gain access. Access control models have a subject and an object. The subject - the human user - is the one trying to gain access to the object - usually the software. In computer systems, an access control list contains a list of permissions and the users to whom these permissions apply. Such data can be viewed by certain people and not by other people and is controlled by access control. This allows an administrator to secure information and set privileges as to what information can be accessed, who can access it and at what time it can be accessed.