Access Control System definition

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:

• Something only known to the user, such as a password or PIN
• Something that is part of the user, such as a fingerprint, retina scan or another biometric measurement
• Something that belongs to the user, such as a card or a key

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.