Method and device for detecting an attempt to substitute an original casing portion of an electronic system with a replacement casing portion
First Claim
1. A card reader comprising a package formed of at least one first package portion connected to a second package portion, a display screen, a keyboard having keys, the first package portion comprising openings for the display screens and the keys, the package containing a printed circuit attached to the second package portion and a device for detecting substitution of the first package portion, said device comprising:
- a first integrated circuit attached to the first package portion; and
a second integrated circuit attached to the printed circuit and operative to transmit to the first integrated circuit successive random or pseudo-random digital signals, the first integrated circuit operative to send back to the second integrated circuit, for each digital signal, a first signature encrypted based on said digital signal, the second integrated circuit operative to determine a second signature encrypted based on said digital signal and to detect a substitution of the first package portion if the first and second encrypted signatures are different.
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Accused Products
Abstract
The invention relates to an electronic system comprising a casing consisting of at least first and second casing portions and containing a device for detecting the substitution of the first casing portion. The device comprises a first integrated circuit intended to be fixed to the first casing portion and a second integrated circuit intended to be fixed to the second casing portion. The second circuit is adapted to transmit to the first integrated circuit successive random or pseudo-random digital signals (R). The first integrated circuit is adapted to return to the second integrated circuit, for each digital signal, the first encrypted signature (S) from said digital signal. The second integrated circuit is adapted to determine a second encrypted signature (S′) from said digital signal and to detect a substitution of the first casing portion if the first and second encrypted signatures are different.
13 Citations
9 Claims
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1. A card reader comprising a package formed of at least one first package portion connected to a second package portion, a display screen, a keyboard having keys, the first package portion comprising openings for the display screens and the keys, the package containing a printed circuit attached to the second package portion and a device for detecting substitution of the first package portion, said device comprising:
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a first integrated circuit attached to the first package portion; and a second integrated circuit attached to the printed circuit and operative to transmit to the first integrated circuit successive random or pseudo-random digital signals, the first integrated circuit operative to send back to the second integrated circuit, for each digital signal, a first signature encrypted based on said digital signal, the second integrated circuit operative to determine a second signature encrypted based on said digital signal and to detect a substitution of the first package portion if the first and second encrypted signatures are different. - View Dependent Claims (2, 3, 4, 5)
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6. A method for detecting substitution of a first package portion of a card reader, the card reader further comprising a second package portion connected to the first package portion, the first package portion and the second package portion forming a package, the card reader further comprising a display screen, a keyboard having keys, the first package portion comprising openings for the display screens and the keys, the package containing a printed circuit attached to the second package portion, the method comprising:
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providing a first integrated circuit attached to the first package portion and a second integrated circuit attached to the printed circuit; having the second integrated circuit transmit to the first integrated circuit successive random or pseudo-random signals; having the first integrated circuit send back to the second integrated circuit, for each digital signal, a first signature encrypted based on said digital signal; and having the second integrated circuit determine a second signature encrypted based on said digital signal and detect a substitution of the first package portion if the first and second encrypted signatures are different. - View Dependent Claims (7, 8, 9)
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Specification