Patent
Encryption processing apparatus, encryption method, and computer program
Taizo Shirai,Kyoji Shibutani,Toru Akishita,Shiho Moriai +3 more
- 29 Aug 2007
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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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Abstract: A common-key blockcipher processing structure that makes analysis of key more difficult and enhances security and implementation efficiency is realized. In a key scheduling part in an encryption processing apparatus that performs common-key blockcipher processing, a secret key is input to an encryption function including a round function employed in an encryption processing part to generate an intermediate key, and the result of performing bijective transformation based on the intermediate key, the secret key, and the like and the result of performing an exclusive-OR operation on the bijective-transformed data are applied to round keys. With this structure, generation of round keys based on the intermediate key generated using the encryption function whose security has been ensured is performed, thereby making it possible to make analysis of the keys more difficult. The structure of the key scheduling part can be simplified, thereby making it possible to improve the implementation efficiency.
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Citations
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Zhang Ming
- 22 Dec 2016
TL;DR: In this paper, an encryption method and an encryption apparatus are described, which consists of generating an AES initial key by using an SAES encryption algorithm, and expanding the AES initialization key to obtain an AES encryption key; and encrypting information to be encrypted by using the AES encryption encryption key according to an AES algorithm to generate encrypted data.
12
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- 15 Jan 2014
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12
Patent
Cryptographic processing apparatus, cryptographic-processing-algorithm constructing method, and cryptographic processing method, and computer program
Shirai Taizo,Kyoji Shibutani +1 more
- 17 Jul 2007
TL;DR: In this article, a common-key block cipher based on the DSM with a high resistance to linear analysis and differential analysis is realized, where a plurality of different matrices satisfying a condition in which a minimum number of branches for all of the data lines is equal to or more than a predetermined value are selected as the matrices, each of the minimum numbers of branches corresponding to the lines being based on linear transformation matrices included in F-functions that are input to a corresponding data line in the extended Feistel structure.
12
References
Generalized Feistel Networks
Kaisa Nyberg
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TL;DR: A simple network of small s-boxes can be proven secure against differential and linear cryptanalysis.
152
Patent
Data conversion device and data conversion method
Tetsuya c,o Mitsubishi Electr. E. Co. Ichikawa,Tomomi c,o Mitsubishi Denki K. K. Kasuya,Mitsuru c,o Mitsubishi Denki K. K. Matsui +5 more
- 07 Mar 2003
TL;DR: In this paper, a sub-converter is provided in a data conversion apparatus for data encryption/decryption, where the sub converter converts data and transfers data that is nonlinear converted in a main converter or a key that is outputted from a key KL register 240 by switching between the data conversion function and data or key transfer function.
44
Patent
Performance enhancement for ANSI X3.92 data encryption algorithm standard
Chang Y. Kao,James P. Kuruts,Sivarama K. Kodukula +2 more
- 17 Jul 1992
TL;DR: In this paper, it is shown that if the left half of the input data is expanded and XOR'ed with the second key at the same time the right half of input data which is still going through its XOR, S-function, permute and expansion, then this expanded result can be immediately XOR"ed with left input data being expanded and xor'ed in parallel.
34
Patent
Data conversion device and data conversion method
Tomomi Kasuya,Mitsuru Matsui,Tetsuya Ichikawa +2 more
- 07 Mar 2003
TL;DR: In this paper, a sub-converter is provided in a data conversion apparatus for data encryption/decryption, where the sub converter converts data and transfers data that is nonlinear converted in a main converter or a key that is outputted from a key KL register 240 by switching between the data conversion function and data or key transfer function.
14
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
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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