A method and system for providing copy-protection on a...

G - Physics – 11 – C

Patent

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G11C 16/22 (2006.01) G11B 20/00 (2006.01)

Patent

CA 2332034

In a method for providing copy-protection services on a storage medium (for instance a solid state memory module), the data are arranged in sectors to which a field (S4T) is associated, where said field contains a random value Ri which is changed randomly when writing data to said sector. By encrypting the data stored on the medium using a key which depends critically on said random numbers, bit-by-bit copies (apart from said random numbers, which can not be deterministically changed by an application) to a second storage medium or recopies from some intermediate storage medium, can not be decrypted because the values of said random numbers will have changed, thus preventing unauthorized duplication and replay attacks.

Dans un procédé assurant des services de protection contre la copie sur un support mémoire (par exemple un module mémoire à semi-conducteurs) les données sont situées dans des secteurs auxquels est associée une zone (S4T), ladite zone contenant une valeur aléatoire RI qui varie de manière aléatoire lors de l'écriture de données sur ledit secteur. Le fait de chiffrer les données stockées sur le support à l'aide d'une clé de chiffrement qui dépend nécessairement et essentiellement desdits nombres aléatoires ne permet pas de déchiffrer les copies bit par bit (sans lesdits nombres aléatoires, qui ne peuvent être modifiés de manière déterministe par une application) sur un deuxième support mémoire ou les recopies d'un support mémoire intermédiaire étant donné que les valeurs desdits nombres aléatoires auront changé, ceci empêchant les tentatives de réexécution et de reproduction non autorisées.

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