Patent
Data converter, data conversion method, data conversion program, and computer readable recording medium recorded with data conversion program
Ichikawa Tetsuya,Kasuya Tomomi,Matsui Mitsuru,哲也 市川,充 松井,智巳 粕谷 +5 more
- 23 May 2002
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TL;DR: In this paper, the authors proposed to reduce the size of a data converter by changing over the data conversion function and the data or key transfer function by a sub-conversion section.
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Abstract: PROBLEM TO BE SOLVED: To downsize a data converter. SOLUTION: A sub-conversion section 330 existing in the data converter for performing encryption/decryption of data has a data transfer function or key transfer function together with a data conversion function and performs the transfer of the data subjected to nonlinear conversion in a main conversion section 320 together with the conversion of the data or the transfer of the key outputted from a key KL register 240 by changing over the data conversion function and the data or key transfer function. COPYRIGHT: (C)2004,JPO
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Citations
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Taizo Shirai,Kyoji Shibutani,Toru Akishita,Shiho Moriai +3 more
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TL;DR: In this article, a common-key blockcipher processing configuration with enhanced immunity against attacks such as saturation attacks and algebraic attacks (XSL attacks) is realized, where S-boxes serving as non-linear transformation processing parts set in round-function executing parts are configured using at least two different types of s-boxes.
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Taizo Shirai,Kyoji Shibutani,Toru Akishita,Shiho Moriai +3 more
- 29 Aug 2007
TL;DR: In this article, the authors proposed a high-security cryptographic processing apparatus that increases difficulty in analyzing the key of a common-key-block cipher, and a method therefor, to realize cryptographic processing whereby resistance to linear cryptanalysis attacks in the Common-Key-Block cipher is improved.
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Encryption processing device, encryption processing method, and program
Kyoji Shibutani,Atsushi Mitsuda,Toru Akishita,Takanori Isobe,Taizo Shirai,Harunaga Hiwatari +5 more
- 20 Feb 2012
TL;DR: An encryption processing device including an encryption processing part configured to divide configuration bits of data to be data processed into plural lines and to input, and to repeatedly execute data conversion processing applying a round function to each line of data as a round calculation as discussed by the authors.
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Patent
Encryption processing apparatus, encryption method, and computer program
Taizo Shirai,Kyoji Shibutani,Toru Akishita,Shiho Moriai +3 more
- 29 Aug 2007
TL;DR: In this paper, a common-key blockcipher processing structure that makes analysis of key more difficult and enhances security and implementation efficiency is realized, where a secret key is input to an encryption function including a round function employed in an encryption processing part to generate an intermediate key.
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