Tamper-proof card associating a high storage density information medium with a microcircuit, and its use in a card reader
AssigneeGemplus Card International
InventorGilles Lisimaque
Life of this patent
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Abstract
The card has a plastic support bearing, on at least one part of its surface, a layer of recording material and a microcircuit inserted in the plastic support. The card is made tamper-proof by the setting up of an identifier code that is characteristic of the relationship between the microcircuit and the support bearing the recording layer. This code is, firstly, recorded in the memory of the microcircuit and, secondly, detectable by analysis of the support. Any detachment of the support and of the microcircuit in which the related code has been memorized prevents the checking of the two codes by coincidence. The invention can be applied notably to high storage density cards.
Claims8
A tamper-proof card including a flat support bearing on at least one part of a first surface, a layer of recording material, and on a second surface opposite to the first surface, a microcircuit inserted in the support, said microcircuit having an identifier code which identifies a relationship between the recording material and the microcircuit, memorized in a tamper-proof zone of a memory of the microcircuit, said identifier code being detectable by analysis of the layer of recording material at a location situated in opposite the microcircuit, a validation of the card being obtained when said code read from the memory of the microcircuit is equal to the code detected in the layer of recording material, indicating the support and the microcircuit have not been detached from each other, said identifier code being a function of the relationship between the support bearing the recording material and the microcircuit, representing a deformation of the support due to an insertion of the microcircuit into the support.
Dependencies are inferred from the claim text.