Patent ID: 7480801

Claim:
A method in a mobile network environment for securing data traffic between an external network and a terminal of a mobile user coupled to the external network, wherein the mobile user can be authenticated in a home location network by way of a private home location key pair, the method which comprises: a) producing a private external key pair by exchanging partial keys between the terminal and a data securing device of the external network; b) transmitting from the data securing device to the home location network an item of key information based on at least one of the partial keys and a message certified by the terminal by way of a first home location key of the private home location key pair; c) verifying the certification of the message in the home location network with a second home location key of the private home location key pair, and producing a certificate for the key information; d) transmitting the certificate to the data securing device; and e) accepting the private external key pair for securing the data traffic subject to verification of the certificate transmitted from the home location network.