Title:
DATA DIFFUSION DEVICE AND DATA DIFFUSION METHOD
Document Type and Number:
Japanese Patent JP2622223
Kind Code:
B2
Abstract:
PURPOSE: To improve diffusion efficiency and to make processing high speed by dividing input data into blocks of the same data length, taking in and resoluting data from the other block, and outputting a new diffusion data.
CONSTITUTION: When diffusion output data of 32 bits is obtained from an input data of 32 bits, first of all, an input data block R of 32 bits is divided into process blocks R0-R3 of 1 byte. And each data is inputted to it, operation with the other data directly or indirectly performed at least one time, and a new data having same length as that of the input data is generated. After this process procedure, process blocks R0-R3 are supplied and they become output blocks, but each output blocks all are generated under influence of input blocks. Mutual interference between these process blocks is realized with form of input to an exclusive logic circuit XOR and a character resolution and substitution function operation section S. Therefore diffusion efficiency of data can be improved without using an inverted function.
Inventors:
Akihiro Shimizu
Miyaguchi Shoji
Miyaguchi Shoji
Application Number:
JP7477892A
Publication Date:
June 18, 1997
Filing Date:
March 30, 1992
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
NTT DATA Communications Corporation
NTT DATA Communications Corporation
International Classes:
G09C1/00; (IPC1-7): G09C1/00; G09C1/00
Domestic Patent References:
| JP333269B2 |
Other References:
電子情報通信学会論文誌Ｄ、Ｊ７０−Ｄ［７］（１９８７）、高速データ暗号アルゴリズムＦＥＡＬ、Ｐ．１４１３−１４２３
Attorney, Agent or Firm:
Takashi Sawai
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