| 摘要 |
<p>The invention relates to a method of signing a main computer file (FP), of the type consisting in making circuits of an information processing device (1,3,4) calculate at least one signature (SG) of the file, taking into account at least one secret data item (S; Sd) specific to the signatory, but unknown to the latter, memorised in a secret memory area of a portable electronic object (4), with a memory and processing circuits, available to the signatory, and in linking the calculated signature to the main file. It is characterised in that, upon the calculation of each signature, it further consists in taking account of at least a part of the main file, so that the signature is a function of the secret data item of the signatory and of each part of the file taken into account, and in creating a secondary file (FS) and in writing therein at least some information (IN) making it possible to identify each part of the main file having served for the calculation of this signature, and in linking the secondary file, on the one hand to the corresponding signature, and, on the other hand, to the signed file. <IMAGE></p> |
