METHOD AND SYSTEM FOR CERTIFYING A USER IDENTITY

System for certifying the identity of a user of a terminal ( 10 ) after the execution of a procedure for controlling access to a packet network ( 20 ). The system comprises an access server ( 11 ) adapted to receive a correlation element from said terminal ( 10 ) at the time of a request for connection to said packet network ( 20 ), an identity server ( 14 ) adapted to send a cookie to the terminal ( 10 ) after receiving a request from the terminal ( 10 ), and a proxy server ( 12 ) adapted to send said correlation element and a user identifier from said access server ( 11 ) to a database ( 13 ) connected to the identity server ( 14 ), the terminal ( 10 ) being adapted to send said cookie at the time of a request for connection to a service provider ( 30 ) in order to retrieve said user identifier sent at the time of execution of said procedure for controlling access to the packet server ( 20 ). Application to certifying the identity of a terminal user at the time of a request to authenticate said user after the execution of a procedure for controlling access to a packet network.