METHOD FOR A SECURE EXECUTION OF A HARDWARE INSTRUCTION

The present invention relates to a method for a secure execution of a first instruction by processing means of an electronic system, comprising :- fetching (S1) said first instruction in an execution pipeline of the processing means,- determining (S2) that said first instruction to be executed is an instruction sensitive to a determined attack, wherein said first instruction, when executed by the processing means, causes the processing means to perform a first function,- selecting (S3), based on said determined attack, from an internal memory of said processing means, at least one second instruction, which, when executed by the processing means, causes the processing means to perform a combination of said first function and a dedicated security countermeasure against said determined attack,- executing (S4) said selected second instructions instead of said first instruction.