Mobile telephone system with prepaid card

Details Mobile telephone system with prepaid card Mobile telephone system with prepaid card

H - Electricity

04

M

H04M 17/00 (2006.01) H04M 15/30 (2006.01)

Patent

CA 2323002

The invention concerns mobile telephones with prepaid cards, characterised in that the prepaid card (18) contains the rate fixing parameters (120) used by the mobile telephone (16) to compute the amounts to be debited (126) on the card pay units counter. The message exchanges between the mobile telephone and the card are encrypted to ensure the security of transactions, preferably by using a cryptographic certificate.

L'invention concerne les téléphones mobiles utilisant des cartes de prépaiement. L'invention réside dans le fait que la carte à prépaiement (18) contient les paramètres de tarification (120) qui sont utilisés par le téléphone mobile (16) pour calculer les débits (126) à effectuer sur le compteur d'unités de paiement de la carte. Les échanges de messages entre le téléphone mobile et la carte sont chiffrés pour assurer la sécurité des transactions, de préférence en utilisant un certificat cryptographique.

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