Digital electronic component which is protected against electrical-type analyses
This invention relates to a digital electronic component which is protected against electrical- and/or electromagnetic-type analyse). The inventive component comprises: a synchronous element ( 10 ) which is controlled by a clock (H); means ( 11, 12 ) of generating said clock (H), the frequency of which varies randomly between a minimum value and a maximum value for at least a given period of time; and means ( 13 ) of controlling the random nature of the frequency change of said clock (H).
1. A digital electronic component that is protected against analyzes of the electrical and electromagnetic type comprising a synchronous element driven by a clock, wherein the clock comprises a random frequency instruction generator and wherein the frequency of the clock varies in a random manner between a minimum value and a maximum value during at least a given time period; and wherein the frequency generator comprises at least at least two PLL circuits as frequency synthesizers and means for switching from a first frequency to a second frequency by switching from a first PLL circuit to a second PLL circuit.
2. The component according to claim 1 , in which the synchronous element is the central unit of a chip card.
3. The component according to claim 2 , in which the controller is driven by the central unit.
4. The component according to claim 1 , in which the synchronous element is a memory.
5. The component according to claim 1 , in which the synchronous element is a cabled synchronous function.
6. The component according to claim 1 , in which the frequency excursion of the clock is between 1 Mhz and 100 Mhz.
7. The component according to claim 1 , further comprising means for controlling the random manner of the clock.