Method of debiting an electronic payment means

Details Method of debiting an electronic payment means Method of debiting an electronic payment means

G - Physics

07

F

G07F 7/10 (2006.01) G07F 7/08 (2006.01)

Patent

CA 2235739

The invention provides a method for protectedly debiting an electronic payment means (11), such as a telephone card. In the communication protocol between a payment means (11) and a payment station (12), an authentication is used to identify the payment means during various steps of the protocol. According to the invention, the authentications are mutually related by states (Y1, Q2) of a cryptographic process (F) in order to be capable of detecting an interference in the protocol. The method may be applied to existing payment cards having a dynamic memory, it being guaranteed that the contents of the dynamic memory, in which there is located information related to the authentication, is not lost during the protocol.

L'invention concerne un procédé servant à débiter de manière protégée des moyens de paiement électronique (11), tels qu'une carte de téléphone. Dans un protocole de communication entre des moyens de paiement (11) et une station de paiement (12), il est procédé à une authentification afin d'identifier les moyens de paiement au cours des divers étapes du protocole. Selon l'invention, ces authentifications sont associées entre elles par des états (Y1, Q2) d'un processus de chiffrement (F), afin de pouvoir détecter une interférence dans ledit protocole. On peut appliquer ce procédé aux cartes de crédit existantes et possédant une mémoire dynamique, avec la garantie que le contenu de la mémoire dynamique, dans laquelle se trouvent les informations relatives à l'authentification, ne sera pas perdu pendant les étapes du protocole.

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