COUNTERMEASURE METHOD IN A MICROCIRCUIT, MICROCIRCUIT THEREFOR AND SMART CARD COMPRISING SAID MICROCIRCUIT

摘要

The invention concerns a countermeasure method in a microcircuit comprising a processor capable of performing operations one of which consists in processing at least a secret datum, said microcircuit including at least a non-volatile storage containing the secret datum or data, at least a work storage, said storage units being connected via a bus to said processor. The invention is characterised in that the method comprises injecting on the bus several random data between data derived from operations performed by the processor, said random data being designed to reload or unload the bus randomly. The invention is applicable to smart cards.