Tickets stored in smart cards

Details Tickets stored in smart cards Tickets stored in smart cards

G - Physics

06

K

G06K 19/07 (2006.01) G07F 7/00 (2006.01) G07F 7/08 (2006.01) G07B 15/00 (2006.01)

Patent

CA 2262760

In a smart card (1) electronic tickets (20) are securely stored. Ticket data may be written into the fields (21, 22, 23) of a ticket (20) in a protected manner using a special code. Tickets (20) may comprise several fields: an entitlement field (21), a validation field (22), and preferably also a verification field (23). Preferably, a different key (K1, K2, K3) is used for each type of field. A further protection of the integrity of the tickets is obtained by using a first storage command (UPDATE) to prepare a field when issuing the ticket and using a different, second storage command (WRITE) when validating the ticket. Thus the fraudulent modification of an issued ticket is prevented.

Cette invention concerne une carte intelligente (1) dans laquelle des billets électroniques (20) sont stockés en toute sécurité. Les données des billets peuvent être écrites de manière protégée dans les champs (21, 22, 23) d'un billet (20) en utilisant un code spécial. Les billets (20) peuvent comprendre plusieurs champs comme, par exemple, un champ prestation (21), un champ validation (22) et aussi, de préférence, un champ vérification (23). On utilise de préférence un clé différente (K1, K2, K3) pour chaque type de champ. Une protection supplémentaire assurant l'intégrité des billets peut être obtenue en utilisant une première instruction de stockage (MISE A JOUR) qui permet de préparer un champ lors de l'émission du billet, ainsi qu'une seconde instruction de stockage (ECRITURE) lors de la validation dudit billet. Ce système permet d'éviter toute modification frauduleuse d'un billet émis.

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