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

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

H - Electricity

04

L

H04L 9/28 (2006.01)

Patent

CA 2372915

The present invention is an integrated circuit card communicating data with a reader/writer. The integrated circuit card includes a cipher processing apparatus, having 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.

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