Abstract: A method for executing a machine code with a computer, including constructing a signature for a current instruction on the basis of signals generated by a stage of a hardware processing path, this stage being a decoder or a stage following the decoder in the hardware processing path, and on the basis of the preceding signature constructed for an instruction which precedes it, then checking the integrity of the executed machine code by comparing the signature constructed for the current instruction with a prestored reference signature, then only when the integrity of the current instruction has been checked successfully, decrypting a cryptogram of the following instruction using the signature constructed for the current instruction.

Abstract: An execution method includes supplying of a machine code, the machine code being formed by a succession of base blocks and each base block being associated with a signature and comprising instructions to be protected. Each instruction to be protected is immediately preceded or followed by an instruction for constructing the value of the signature associated with the base block. Each construction instruction is coded on strictly less than N bits, and each word of the machine code which comprises at least one portion of one of said instructions to be protected also comprises one of the construction instructions so that A is not possible to load an instruction to be protected into an execution file, without at the same time loading a construction instruction which modifies the value of the signature associated with the base block when it is executed.

Abstract: This execution method comprises the supplying of the machine code, this machine code being formed by a succession of base blocks, each base block being associated with a signature and comprising instructions to be protected, each instruction to be protected being immediately preceded or followed by an instruction for constructing the value of the signature associated with this base block, wherein: each construction instruction is coded on strictly less than N bits, and each word of the machine code which comprises at least one portion of one of said instructions to be protected also comprises one of said construction instructions so that it is not possible to load an instruction to be protected into an execution file, without at the same time loading a construction instruction which modifies the value of the signature associated with this base block when it is executed.