Method for controlling the execution of a request for action...

G - Physics – 07 – F

Patent

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G07F 7/10 (2006.01)

Patent

CA 2338447

The invention concerns a method for exchanging synchronised messages between an application server and at least a chip card, wherein the card transmits a message to the server containing the latest current value of an action counter stored by the server; the server emits a message comprising a request including one or several actions to be implemented by the card and stores the number n of actions of the request; the card receives the message, successively executes the action or actions in the request incrementing its action counter between each action if the action has been successfully executed; when there is a request for a transaction by the card, the server compares the received action counter value with the latest value stored, incremented by the number of actions contained in the previous request for actions and, operates on the basis of this comparison.

L'invention concerne un procédé d'échange de messages avec synchronisation entre un serveur d'application et au moins une carte à puce. Pour cela la carte transmet un message au serveur contenant la dernière valeur courante d'un compteur d'actions que le serveur stocke; le serveur émet un message comportant une demande comprenant une ou plusieurs actions à mettre en oeuvre par la carte et stocke le nombre n d'actions de la demande; la carte reçoit le message, exécute successivement la ou les actions de la demande en incrémentant son compteur d'actions entre chaque action si l'action s'est bien exécutée; lors d'une demande de transaction par la carte, le serveur compare la valeur du compteur d'actions reçue, à la dernière valeur stockée, incrémentée du nombre d'actions contenues dans la demande d'actions précédente et, exploite le résultat de cette comparaison.

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