Title:
【発明の名称】暗号処理装置、ICカード及び暗号処理方法
Document Type and Number:
Japanese Patent JP3088337
Kind Code:
B2
Abstract:
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.
Inventors:
Mitsuru Matsui
Toshio Tokita
Toshio Tokita
Application Number:
JP14132897A
Publication Date:
September 18, 2000
Filing Date:
May 30, 1997
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G09C1/00; H04L9/06; H04L9/28; G06K17/00; (IPC1-7): G09C1/00; G09C1/00
Domestic Patent References:
| JP8179690A | ||||
| JP990870A | ||||
| JP3129384A | ||||
| JP675525A |
Other References:
【文献】国際公開97/9705(WO,A1)
Attorney, Agent or Firm:
Shoji Mizoi