Method for reducing memory space requirement for an...

Details Method for reducing memory space requirement for an... Method for reducing memory space requirement for an...

G - Physics

06

F

G06F 12/14 (2006.01) H04L 9/08 (2006.01)

Patent

CA 2312358

In order to save the storage space required for a secret key, the latter is subdivided into blocks, the blocks are then permutated and a permutation- linked index is stored. The index is significantly shortened in relation to the secret key. On the other hand, the secret key can be recovered from the index by determining the permutation in the index. The secret key is determined by means of the non-secret permutated blocks and the permutation. The invention also relates to an arrangement, i.e. a chip card, for coding and decoding.

Pour réduire l'encombrement de mémorisation pour une clé secrète, celle-ci est subdivisée en blocs, les blocs sont permutés et un index connecté à la permutation est conservé en mémoire. L'index est considérablement raccourci par rapport à la clé. Inversement, la clé secrète peut être retrouvée à partir de l'index en déterminant la permutation dans l'index. La clé secrète est déterminée au moyen des blocs permutés non maintenus secrets et de la permutation. L'invention concerne en outre un dispositif, par exemple une carte à puce, destiné à effectuer le codage et le décodage.

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