Method of identifying a data carrier

Details Method of identifying a data carrier Method of identifying a data carrier

G - Physics

06

K

G06K 19/12 (2006.01)

Patent

CA 2244216

A method of identifying a data carrier (15) such as a credit card benefit card, access control card, identity card or stored value card, carrying data in the form of a plurality of rational number (12, 13, 14) in a sequence, successive numbers having a marker (11) between them comprises a) measuring the distance (17) from a fixed point (16) on the data carrier to a given part of a marker, b) dividing this distance by the distance between corresponding given parts of successive markers, thereby obtaining a rational number (x), and c) subtracting this rational number (x) from the number in the sequence adjacent the said marker in a given direction, thereby obtaining a further rational number which is capable of identifying the data carrier uniquely.

La présente invention concerne un procédé d'identification d'un support d'informations (15) tel qu'une carte de crédit, d'assurance sociale, de contrôle d'accès, d'identité ou de monétique rechargeable, qui porte des informations sous la forme de plusieurs nombres rationnels (12, 13, 14) dans une séquence, des nombres successifs ayant un marqueur (11) entre eux. Ce procédé comprend: a) la mesure de la distance (17) entre un point fixe (16) du support d'informations et une partie donnée d'un marqueur, b) la division de cette distance par la distance entre des parties données correspondantes de marqueurs successifs, ce qui donne un nombre rationnel (x), et c) la soustraction de ce nombre rationnel (x) du nombre de la séquence qui est voisin du marqueur en question dans une direction donnée, ce qui donne un autre nombre rationnel qui est capable d'identifier le support d'informations d'une manière univoque.

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