Method for Securing Data Traffic in a Mobile Network

Pub. Number EP 1468520
Appl. Data EP 03731654 2003 01 07
Applicant Siemens Aktiengesellschaft
Inventor(s) EUCHNER, Martin
MODERSHEIM, Sebastian
TEJ, Haykal
LOTZ, Volkmar

Title: METHOD FOR SECURING DATA TRAFFIC IN A MOBILE NETWORK ENVIRONMENT

Abstract: In order to secure data traffic between an external network (VN) and a terminal (EG) of a mobile telephone user coupled to the external network (VN), the terminal (EG) and a data securing device (VGK) of the external network produce a pair of private external keys (FS) by exchanging partial keys (TX, TY). According to the invention, one item of key information (W) based on at least one of the partial keys (TX, TY), and one message (RRQ) certified by the terminal (EG) by means of a first home location key (HS) of the pair of home location keys, are transmitted by the data securing device (VGK) to the home location network (HN). The certification of the message (RRQ) is verified by means of a second home location key (HS) of the pair of home location keys and a certificate (HMAC hs (W)) is provided for the key information. The certificate thus provided is transmitted to the data securing device (VGK) and the pair of private external keys (FS) subject to the verification of the transmitted certificate (HMAC hs (W)) is accepted in order to secure data traffic.