Method for secure storage management

G - Physics – 07 – F

Patent

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

Patent

CA 2309243

The invention concerns a method for reducing occupancy of descriptors (41) used for protecting files (44) in storage; it consists in organising security by separating the functions (22-28) whereto the files (reading, writing, erasing...) are going to be subjected from the protection modes (19-21) to which said functions should subscribe to be executed on the files concerned. The descriptors then comprise a number of octets (47-49) equal to the number of protection modes proposed. The bits of these octets depending on whether they are active or inactive refer to function memory words (50) whose number is directly equal to the number of active bits in the mode memory words. The function memory words comprise references to secret codes (15) to be used for implementing the desired security functions.

Le procédé a pour objet de réduire l'occupation en mémoire des descripteurs (41) servant à la protection des fichiers (44) mémoires. On organise la sécurité en séparant les fonctions (22-28) auxquelles vont être soumis les fichiers (lecture, écriture, effacement...) des modes de protection (19-21) auxquels devront souscrire ces fonctions pour pouvoir être exécutées sur les fichiers concernés. Les descripteurs comportent alors un nombre d'octets (47- 49) égal au nombre de modes de protection envisagé. Les bits de ces octets selon qu'ils sont à l'état actif ou inactif renvoient à des mots (50) mémoires de fonction dont le nombre est directement égal au nombre de bits actifs dans les mots mémoire de mode. Les mots mémoire de fonction comportent des références à des codes secrets (15) utilisables pour mettre en oeuvre les fonctions sécurisées recherchées.

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