Method and device for calculating computer file signatures

Details Method and device for calculating computer file signatures Method and device for calculating computer file signatures

G - Physics

06

F

G06F 12/14 (2006.01) G07F 7/10 (2006.01) G07F 7/12 (2006.01)

Patent

CA 2120294

The invention relates to a process for the signature of a main computer file (FP), of the type consisting in having the circuits of an information processing device (1, 3, 4) calculate at least one signature (SG) for the file based on at least one secret datum (S; Sd) proper to the signatory, but unknown to the signatory, stored in a secret memory zone of a portable electronic object (4), with processing circuits and memory, available to the said signatory, and in relating the said calculated signature to the main file. It is distinctive in that, during the calculation of each signature, it consists also in taking into account at least one part of the main file so that the signature is based on the signatory's secret datum and on each part of the file that is taken into account, and in creating a secondary file (FS) and entering in it at least the information (IN) required to identify each part of the main file that was used to calculate the said signature, and in relating the secondary file to the corresponding signature and to the signed file.

L'invention concerne un procédé de signature d'un fichier principal (FP) informatique, du genre consistant à faire calculer, par des circuits d'un dispositif (1,3,4) de traitement de l'information, au moins une signature (SG) du fichier, en prenant en compte au moins une donnée secrète (S; Sd) propre au signataire, mais inconnue de celui-ci, mémorisée dans une zone de mémoire secrète d'un objet portatif électronique (4), à mémoire et circuits de traitement, à la disposition de ce signataire, et à lier la signature calculée au fichier principal. Il est caractérisé en ce que, lors du calcul de chaque signature, il consiste en outre à prendre en compte, au moins une partie du fichier principal, de sorte que la signature est fonction de la donnée secrète du signataire et de chaque partie prise en compte du fichier, et a créer un fichier secondaire (FS) et y inscrire au moins des informations (IN) permettant d'identifier chaque partie du fichier principal ayant servi au calcul de cette signature, et à lier le fichier secondaire d'une part à la signature correspondante et d'autre part au fichier signé.

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