Electronic component suitable for detecting attacks by delivering energy
The electronic component comprises: reference-obtaining means for obtaining a physical magnitude referred to as a reference magnitude, which magnitude is dynamically adjustable and representative of the expected activity of said component; comparator means suitable for comparing said reference magnitude with a magnitude of the same type representative of the real activity of said component; and detector means suitable for detecting an attack as a function of the result of said comparison.
1. An electronic component comprising:
a reference-obtaining device configured to obtain a physical magnitude, referred to as a reference magnitude, which is dynamically adjustable and representative of an expected activity of said component;
a tracking circuit configured to output a value representative of real activity of said component;
a first comparator configured to compare said dynamically adjustable reference magnitude with a magnitude of the value of a same type representative of real activity of said component; and
a detector configured to detect an attack as a function of a result of said comparison,
wherein the component comprises a plurality of modules, the dynamically adjustable reference magnitude being a function of the active or non-active character of each module of the plurality of modules and is representative of an expected activity of the component.
2. The electronic component according to claim 1 , including a second comparator configured to compare a current representative of the current actually consumed by said component with a variable reference current that is dynamically adjustable to represent the activity expected of said component.
3. The electronic component according to claim 2 , including a logic unit configured to generate an electric current of magnitude that is equal to said variable reference current.
4. The electronic component according to claim 2 , wherein said reference current being representative, at a given instant, of a maximum expected consumption of the at least one module active at that instant.
5. The electronic component according to claim 4 , wherein said logic unit has as many resistors in parallel as the component has modules, each resistor being connected to one of said at least one module via a switch and being dimensioned so that the current that flows through said resistor, when said module is active, represents the expected maximum consumption of said at least one module at that instant.
6. The electronic component according to claim 5 , including a processor configured to set said switch as a function of the active or inactive character of said at least one module.
7. The electronic component according to claim 2 , wherein said first comparator is a register presenting an input capacitor configured to be charged or for discharging depending on whether said current representative of the current actually consumed exceeds or does not exceed said reference current.
8. The electronic component according to claim 2 , wherein said current representative of the current actually consumed is obtained by a current mirror from said current that is actually consumed.
9. The electronic component according to claim 1 , further comprising:
a device configured to obtain a “reference” voltage that is dynamically adjustable and that is representative of the expected activity of said component; and wherein
said comparator is configured to compare said reference voltage with a voltage representative of the actual consumption of said component.
10. The electronic component according to claim 9 , including at least one module and a register containing a value representative of the voltage expected across the terminals of said component as a function of the activity of each of said modules.
11. The electronic component according to claim 9 , including:
a resistor in parallel with said component conveying a current of magnitude that is representative of the current actually consumed by said component; and
a register containing a digital value of the voltage across the terminals of said resistor and representative of the actual consumption of said component.
12. A smart card in compliance with the ISO 7816 standard, the card including a microcontroller constituted by an electronic component according to claim 1 .
13. A protection method for protecting an electronic component, the method comprising:
obtaining a “reference” physical magnitude that is dynamically adjustable as representative of an expected activity of said component;
obtaining a value representative of real activity of said component;
comparing said reference magnitude with a magnitude of the value of the same type representative of the actual activity of said component; and
detecting an attack as a function of a result of said comparison,
wherein the component comprises at least one module, the dynamically adjustable reference magnitude being a function of the active or non-active character of each module of the plurality of modules and is representative of an expected activity of the component.
14. A computer program stored on a non-transitory recording medium including instructions for executing the steps of the protection method according to claim 13 when said program is executed by a computer.
15. A non-transitory recording medium readable by a computer having recorded thereon a computer program including instructions for executing the steps of the protection method according to claim 13 .