Authenticating method between a smart card and a terminal

Details Authenticating method between a smart card and a terminal Authenticating method between a smart card and a terminal

G - Physics

07

F

G07F 7/10 (2006.01)

Patent

CA 2351652

The invention concerns a method enabling a smart card and a terminal whereto it is connected to authenticate each other. The invention is characterised in that at the end of each transaction the terminal calculates, from data representing the card at said transaction end, a secret code CSC¿2? which is recorded in a zone ZCSC with unprotected access in the card memory and an authentication certificate CA¿2? which is recorded in a zone ZCA with protected access of the memory by presenting a secret code CSC¿2?. At the next transaction, the terminal calculates, by means of data contained in the card, a secret code and an authentication certificate which are compared to those previously recorded to perform authentication. The invention is applicable to smart cards.

L'invention concerne un procédé qui permet à une carte à mémoire et à un terminal auquel elle est connectée de s'authentifier mutuellement. L'invention réside dans le fait qu'à la fin de chaque transaction le terminal calcule, à partir d'informations représentatives de la carte à cette fin de transaction, un code secret CSC2 qui est enregistré dans une zone ZCSC à accès non protégé de la mémoire de la carte et un certificat d'authentification CA2 qui est enregistré dans une zone ZCA à accès protégé de la mémoire par la présentation du code secret CSC2. A la transaction suivante, le terminal calcule, à l'aide des informations contenues dans la carte, un code secret et un certificat d'authentification qui sont comparés à ceux précédemment enregistrés pour réaliser l'authentification. L'invention est applicable aux cartes à mémoire.

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