SECURE MICROCONTROLLER AGAINST ATTACKS BASED ON CURRENT CONSUMPTION VALUES

摘要

The invention concerns a microcontroller (30) designed to be incorporated in a portable object such as a smart card, comprising at least: a contact plate (VCC) for powering said microcontroller (30); a data input and/or output pad (I/O); an effective data processing part ( DEG CE); and confidential data. The invention is characterised in that the microcontroller further comprises means (GEN; CAP; COM) for varying the supply voltage of the effective data processing part ( DEG CE), said means being capable of making secure the confidential data against attacks based on current consumption values.