Cipher processing apparatus, ic card and cipher processing...

G - Physics – 09 – C

Patent

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Details

G09C 1/00 (2006.01) G06K 19/073 (2006.01) H04L 9/06 (2006.01)

Patent

CA 2261161

29 The present invention can be applied to a cipher processing apparatus, which includes a function F having a configuration of repeating process and inside of the function F, a function f having a configuration of repeating process is included. According to the invention, the cipher processing apparatus is configured by registers 301 through 303 for temporarily holding data, selectors A through C, 311 through 313, and a function f operating circuit 323 for transforming data. An output data from the function f operating circuit 323 is held in the register C 303, and the selector C 313 selects either to repeat the data transformation by the function operating circuit 323 or not. When a cipher processing apparatus includes a function F having a configuration of repeating process and inside of the function F, a function f having a configuration of repeating process is included, the cipher processing apparatus can be embodied efficiently, which enables to reduce the circuit scale and to save electric power.

L'invention concerne un processeur cryptographique configuré pour traiter de façon itérative une fonction F présentant une structure récurrente d'une fonction f, et comportant des registres (301, 303) pour conserver provisoirement des données, des sélecteurs A-C (311-313) pour sélectionner les données à extraire, et un circuit de calcul (323) de la fonction f pour effectuer la conversion des données. Le signal de sortie émanant du circuit de calcul (323) est conservé dans le registre C (303), et le sélecteur C (313) détermine si oui ou non la conversion des données par le circuit de calcul (323) doit être répétée. Lorsque le processeur est configuré pour traiter de façon itérative la fonction F présentant une structure récurrente de la fonction f, il peut être configuré efficacement et l'échelle du circuit ainsi que la consommation électrique peuvent être réduites.

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