COUNTERMEASURE METHOD AND DEVICE AGAINST AN ATTACK BY FAULT INJECTION IN AN ELECTRONIC MICROCIRCUIT
First Claim
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1. A method, comprising:
- detecting that a voltage of at least one of a first local ground terminal and a first power supply terminal crosses a first threshold voltage, the first local ground and first power supply terminals being part of a first data processing circuit of a microcircuit in a substrate, the microcircuit including first and second wells and a first embedded region formed in the substrate, the first well being electrically isolated from a main portion of the substrate by the second well and the first embedded region;
the first local ground terminal being formed in the first well and the first power supply terminal being formed in the second well; and
activating a first detection signal in response to detecting the voltage at the at least one of the first ground and first power supply terminals of the data processing circuit crossing the first threshold voltage.
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Abstract
The disclosure relates to a method for detecting an attack in an electronic microcircuit, comprising: forming the microcircuit in a substrate, forming in the substrate a first well electrically isolated from the substrate, by a second well and an embedded well, forming in the first and second wells a data processing circuit comprising a ground terminal formed in the first well and a power supply terminal formed in the second well, and activating a detection signal when a voltage at the ground or power supply terminal of the data processing circuit crosses a threshold voltage.
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Citations
23 Claims
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1. A method, comprising:
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detecting that a voltage of at least one of a first local ground terminal and a first power supply terminal crosses a first threshold voltage, the first local ground and first power supply terminals being part of a first data processing circuit of a microcircuit in a substrate, the microcircuit including first and second wells and a first embedded region formed in the substrate, the first well being electrically isolated from a main portion of the substrate by the second well and the first embedded region;
the first local ground terminal being formed in the first well and the first power supply terminal being formed in the second well; andactivating a first detection signal in response to detecting the voltage at the at least one of the first ground and first power supply terminals of the data processing circuit crossing the first threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A microcircuit comprising:
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a first data processing circuit that includes a first power supply terminal and a first local ground terminal, the first local ground terminal being positioned in a first well of a substrate, the first well being electrically isolated from a main part of the substrate by a second well of the substrate and a first embedded region of the substrate; and a first detection circuit formed in the substrate, the first detection circuit being configured to activate a detection signal in response to detecting that a voltage of at least one of the first local ground terminal and the first power supply terminal of the first data processing circuit crosses a first threshold voltage. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A microcircuit portable device, comprising:
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a support; and a microcircuit carried by the support and including; a first data processing circuit that includes a first power supply terminal and a first local ground terminal, the first local ground terminal being positioned in a first well of a substrate, the first well being electrically isolated from a main part of the substrate by a second well of the substrate and a first embedded region of the substrate; and a first detection circuit formed in the substrate, the first detection circuit being configured to activate a detection signal in response to detecting that a voltage of at least one of the first local ground terminal and the first power supply terminal of the first data processing circuit crosses a first threshold voltage. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification