Abstract: 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).