A system and method for authenticating a user that requests access to services of a computer network, including using a unique communication address for authentication and identification. One of the methods includes globally assigning unique communication addresses to users and devices, the devices being uniquely associated with respective users. Unique communication addresses associate with the users are used for authenticating and identifying the users. A login function is used through the devices, the devices each being mapped to a unique communication address using a hardware identity configured for sending and receiving information over a network.