Importance

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Abstract

The invention relates to a method for signature of a primary information processing file (FP), of the type consisting of causing circuits of an information processing device (1, 3, 4) to calculate at least one signature (SG) of the file, by using at least one secret datum (S; Sd) specific to the signer, but unknown to him, memorized in a secret memory zone of a portable electronic object (4), having a memory and processing circuits, which is at the disposal of the signer, and linking the calculated signature to the primary file. The invention is also characterized in that when each signature is calculated, it may further use at least one portion of the primary file, such that the signature is a function of the secret datum of the signer and of each portion handled of the file, and creating a secondary file (FS) and writing in it at least information (IN) enabling identification of each portion of the primary file that was used to calculate this signature, and linking the secondary file with the corresponding signature, on the one hand, and with the signed file, on the other.

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First Claim