Method for server-authorised service access from portable...

Details Method for server-authorised service access from portable... Method for server-authorised service access from portable...

G - Physics

06

K

G06K 19/07 (2006.01) G07C 9/00 (2006.01) G07F 7/10 (2006.01) H04L 9/32 (2006.01)

Patent

CA 2246301

A method for server-authorised service access from portable electronic microcircuit devices such as smart cards is disclosed. According to the method, when access is requested, the portable device transmits at least one identification sequence containing at least the value of a ciphertext (C¿i?) produced by executing an iterative algorithm (A2) based on a non-reversible secret-key function (F2), and the server computes a series of ciphertexts (Q¿1?, Q¿2?, ...) from one ciphertext (Q¿0?) using the same algorithm (A2) until a ciphertext (Q¿n?) is found that has the same value as said ciphertext (C¿i?), whereafter access is enabled. The method is particularly suitable for home banking applications.

Lors d'une demande d'accès, le procédé consiste à faire émettre par le dispositif portatif au moins une séquence d'identification contenant au moins la valeur d'un cryptogramme (Ci) qui est le résultat de l'exécution d'un algorithme itératif (A2) basé sur une fonction non inversible (F2) à clé secrète, et à faire calculer par le serveur des cryptogrammes successifs (Q1, Q2, ...) à partir d'un cryptogramme (Q0) et en utilisant le même algorithme (A2) jusqu'à retrouver un cryptogramme (Qn) dont la valeur soit égale à celle du cryptogramme (Ci) pour valider l'accès. Le procédé peut notamment être utilisé dans une application de banque à domicile.

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