Block cipher apparatus using auxiliary transformation

G - Physics – 09 – C

Patent

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G09C 1/00 (2006.01)

Patent

CA 2373432

It is desired to share one circuit by an encryption unit and a decryption unit. A normal data transformation unit (FL) and an inverse data transformation unit (FL-1) are located at point symmetry on a non-linear data transformation unit, and a normal data transformation unit (FL) and an inverse data transformation unit (FL-1) are located at point symmetry on the non-linear data transformation unit. Therefore, the encryption unit and the decryption unit can be configured using the same circuits.

Une unité de conversion directe de données (FL) (251) et une unité de conversion inverse de données (FL<-1>)(273) sont disposées symétriquement par rapport à une unité de conversion de données non linéaires (220); une unité de conversion directe de données (FL) (253) et une unité de conversion inverse de données (FL<-1>)(271) sont disposées symétriquement par rapport à une unité de conversion de données non linéaires (220), ce qui permet à un circuit unique fonctionner comme une partie de chiffrage (200) et une partie de déchiffrage (500).

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