Method of securely modifying data on a smart card

Details Method of securely modifying data on a smart card Method of securely modifying data on a smart card

G - Physics

06

K

G06K 19/073 (2006.01) G07F 7/10 (2006.01)

Patent

CA 2245944

The invention pertains to a method of securely transferring data, such as program data, to a smart card (1). In order to be applicable in non-secure environments, the method of the invention involves a one-way authentication mechanism, comprising the use of a series of interrelated authentication values, (R0, R1, R2, ...). Further security is achieved by using commands (INIT, TRAN) which are each provided with an authentication code (MAC0, MAC1, ...). In order to transfer data only to selected cards, the card may accept transfer commands only if a card profile (CP) matches a distribution profile (DP).

L'invention se rapporte à une technique permettant des transferts sécurisés de données, des données de programme par exemple, vers une carte à puce (1). Afin de pouvoir être utilisée dans des environnements non protégés, la technique selon l'invention fait intervenir un mécanisme unidirectionnel d'authentification reposant sur l'emploi d'une série de valeurs d'authentification en relation mutuelle (R0, R1, R2, ...). La sécurité est, en outre, renforcée du fait de l'utilisation d'instructions (INIT, TRAN) dotées, chacune, d'un code d'authentification (MAC0, MAC1, ...). Afin que le transfert de données ne puisse s'effectuer qu'en direction de cartes sélectionnées, la carte à puce n'accepte les instructions que si le profil de carte (CP) correspond au profil de distribution (DP).

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