Title:
【発明の名称】データ変換方式
Document Type and Number:
Japanese Patent JP2975022
Kind Code:
B2
Abstract:
PURPOSE:To prevent a conversion key from being easily analyzed even at the time of leak of data before and after data conversion by providing a first arithmetic means for arithmetic processing first and second input values and a functional processing means for functional processing between the output of the first arithmetic means and the second input value and taking the output of the functional processing means as the data conversion value. CONSTITUTION:A first arithmetic means 1 for arithmetic processing first and second input values and a functional processing means 2 for functional processing between the output of the first arithmetic means 1 and the second input value are provided. The arithmetic processing first and second input values is performed in the first arithmetic means 1. An arbitrary function is used to perform the functional processing between the second input value used in the first arithmetic means 1 and the output of the first arithmetic means 1 in the functional processing means 2, and the output of the functional processing means 2 is the data conversion value to be obtained. Thus, the conversion key is not easily analyzed even if data before and after data conversion are leaked.
Inventors:
KAWAMURA SHINICHI
Application Number:
JP23962288A
Publication Date:
November 10, 1999
Filing Date:
September 27, 1988
Export Citation:
Assignee:
TOSHIBA KK
International Classes:
G09C1/00; H04L9/06; H04L9/32; (IPC1-7): G09C1/00
Domestic Patent References:
| JP6281140A |
Other References:
【文献】池野,小山「現代暗号理論」第2版,電子情報通信学会,p.56
Attorney, Agent or Firm:
Hideaki Tokawa (1 outside)