An authentication system and method therefor is provided, in which a dedicated system is installed to allow only a computer system which is monopolistically and exclusively supplied by a company operating an information providing server to be used to access the server. Here, the user computer includes an authentication system which generates a specific registration code for the system. The authentication system includes the user computer for generating a registration code for authenticating the user computer, and a system server which receives the registration code of the user computer and ascertains whether or not the user computer is registered.
A plug and play device and an access control method, in which the plug and play device includes an access control device and a main function device. When the plug and play device is connected to a host, the access control device is first connected to the host to execute an authorization procedure. The user is not authorized if the authentication procedure rejects the user. In this case, the plug and play device denies the host control. Conversely, the user is authorized if the authentication procedure approves the user. In this case, the plug and play device connects the main function device to the host and accepts control by the host. After the host loads a proper driver, it may control the plug and play device.
