Enhanced short message and method for synchronising and...

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/22 (2006.01) G07F 7/10 (2006.01) H04L 9/32 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2259287

The invention concerns a particular structure of enhanced short message, and a method for synchronising and ensuring the security of exchanged enhanced short messages having this structure. Conventionally, an enhanced message is transmitted by a message service centre to a subscriber identification module (or SIM module) of a mobile station. The body (2) of this enhanced message contains in particular a first field (3) for remote commands pertaining to a remote application. This body (2) also contains a second field (4) for storing the current value of a synchronising counter, to be compared to a previous value of the synchronising counter, stored in the SIM module. The body (2) can contain another field (6) for storing a certificate, the body signature, for proving the authenticity of the enhanced message and the identity of its transmitter. The enhanced message is accepted or refused by the SIM module depending on the coherence of these values with the internal status of the SIM module.

L'invention concerne une structure particulière de message amélioré, ainsi qu'un procédé de synchronisation et de sécurisation d'un échange de messages améliorés possédant cette structure. De façon classique, un message amélioré est transmis par un centre de service de messages vers un module d'identification d'abonné (ou module SIM) d'une station mobile. Le corps (2) de ce message amélioré contient notamment un premier champ (3) de stockage de commandes distantes appartenant à une application distante. Selon l'invention, ce corps (2) contient également un second champ (4) de stockage de la valeur courante d'un compteur de synchronisation, destinée à être comparée à une valeur précédente du compteur de synchronisation, stockée dans le module SIM. Toujours selon l'invention, le corps (2) peut contenir un autre champ (6) de stockage d'un certificat, signature du corps, destiné à prouver l'authenticité du message amélioré et l'identité de son émetteur. Le message amélioré est accepté ou refusé par le module SIM en fonction de la cohérence de ces valeurs avec l'état interne du module SIM.

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