Digital file management and imaging system and method...

H - Electricity – 04 – L

Patent

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H04L 9/08 (2006.01) H04L 9/32 (2006.01)

Patent

CA 2363465

A digital file management and imaging system records additional independent data with each stored image (200) including a true date gleaned from a secure clock (202) not settable by a user, a number derived from a cyclic redundancy code (CRC) algorithm for the image data (210) and the true date (212). This additional data is recorded within each digital file as soon as possible after the file is acquired. If the file is altered in any way after the recording of the additional data, recalculation of the image CRC on the altered file will not match the original image CRC recorded within it. Thus, the fact that it has been altered can be detected. Likewise, if the true date is altered in any way, recalculation of the date CRC will similarly reveal this fact.

L'invention concerne un système de gestion de fichiers numériques et d'imagerie, qui enregistre des données indépendantes additionnelles avec chaque image (220) stockée, comprenant une date véritable provenant d'une horloge sécurisée (202) qui n'est pas réglée par l'utilisateur, un nombre dérivé d'un algorithme de code de redondance cyclique (CRC) pour les données images (210) et la date véritable (212). Ces données additionnelles sont enregistrées dans chaque fichier numérique le plus vite possible après acquisition du fichier. Si le fichier a subi une quelconque modification après l'enregistrement des données additionnelles, un recalcul du CRC de l'image sur le fichier modifié ne correspondra pas au CRC d'origine de l'image enregistré dans le fichier. La modification peut ainsi être détectée. De même, si la date véritable subit une quelconque modification, un recalcul du CRC fera apparaître cette opération.

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