y of the mobile conforms to the network access identifier (NAI) format containing the international mobile subscriber identity (IMSI) during the first authentication, or during the following authentications, a pseudonym or an identifier for the rapid renewal of authentication. The mobile transmits the CP block (CFG_REQUEST) in the IKE AUTH Request message to obtain its IPv4 and/or IPv6 address, and possibly the IP address of the PGW entity, in the case where the mobility is managed by the mobile. 4) The ePDG entity transmits to the AAA server the AAR (Authenticate and Authorize Request) DIAMETER message containing the identity of the mobile and the information relating to the APN. NAI analysis allows the AAA server to distinguish between authentication for trusted Wi-Fi access based on the EAP-AKA' mechanism and authentication for untrusted Wi-Fi access based on the AKA mechanism. 5) The AAA server requests the home subscriber server (HSS) for mobile cryptographic data in the AIR (Authentication-Information-Request) DIAMETER message. The HSS entity generates the RAND sequence and creates the seals (RES and AUTN) and the keys (CK and IK) from the Ki key and the RAND sequence. 6) The HSS entity passes the authentication vectors to the AAA server in the AIA (Authentication-Information-Answer) DIAMETER message. The AAA server derives the CK and IK to generate the master session key (MSK). 7) The AAA server initiates the authentication procedure with the message EAP Request/EAP-Method AKA Challenge containing the AUTN 144 Wi-Fi Integration to the 4G Mobile Network and RAND parameters. This message is transmitted in the AAA (Authenticate and Authorize Answer) DIAMETER message. 8) The ePDG entity transfers the message EAP Request/EAP-Method AKA Challenge in the message KE AUTH Response containing its identity, certificate and signature. The mobile verifies the signature of the message AUTH Response with the public key of the ePDG entity retrieved from its certificate. The mobile generates the RES, AUTN, CK and IK parame