A method is provided for authenticating a user (10) on a remote server 16a, 16b, 16c of a network 18, comprising the steps of receiving an authentication request from said remote server 16a, 16b, 16c of said network 18 by a terminal device 14, retrieving a respective authentication key from a personal trusted device 12 in which a plurality of network addresses of remote servers 16a, 16b, 16c and corresponding authentication keys are stored in a database, and displaying said authentication key to the user 10 on said personal trusted device 12.