Title:
【発明の名称】暗号装置及び暗号装置を実現するプログラムを記録したコンピューターが読みとり可能な記録媒体
Document Type and Number:
Japanese Patent JP3351305
Kind Code:
B2
Abstract:
The present encryption apparatus is provided with a plurality of conversion means connected in multiple steps, an intermediate-key generating means for performing linear or non-linear conversion for an intermediate-key and subsequently generating an initial-value of the intermediate-key, and an intermediate-key memory means for updating and storing the intermediate-key update information. The present encryption apparatus provides a ciphertext which is refractory to a chosen plaintext cryptanalysis in the evaluation of the key update information. The present apparatus is capable of high speed operation by parallel processing and is also capable of maintaining high speed operation by higher multiplication of the parallel operation even when the number of repetitive conversion is increased.
Inventors:
Yukiyasu Tsunoo
Application Number:
JP21327497A
Publication Date:
November 25, 2002
Filing Date:
August 07, 1997
Export Citation:
Assignee:
NEC
International Classes:
G09C1/00; H04L9/06; H04L9/16; (IPC1-7): G09C1/00; H04L9/16
Domestic Patent References:
| JP6266284A | ||||
| JP6216897A | ||||
| JP4365240A |
Other References:
【文献】宮野浩,「既知および選択平文攻撃を困難にする暗号連鎖方式」,電子情報通信学会技術研究報告,VOL.92
【文献】暗号連鎖方式の一提案,暗号と情報セキュリティシンポジウム,1997年 1月29日,18C
【文献】暗号連鎖方式の一提案,暗号と情報セキュリティシンポジウム,1997年 1月29日,18C
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)