Data encrypting/decrypting conversion methods and apparatuses and data communication system adopting the same

The present invention relates to encryption/decryption techniques for encrypting/decrypting digital data transferred among computers, home-use-destined electric/electronic equipment and the like. Encrypting/decrypting conversion method and apparatus capable of controlling dynamically cyclic shift in...

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Main Authors Aikawa, Makoto, Takaragi, Kazuo, Koreeda, Hiroyuki, Sasamoto, Manabu, Okamoto, Hiroo, Noguchi, Takaharu, Furuya, Soichi, Hirahata, Shigeru
Format Patent
LanguageEnglish
Published 12.08.2003
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Abstract The present invention relates to encryption/decryption techniques for encrypting/decrypting digital data transferred among computers, home-use-destined electric/electronic equipment and the like. Encrypting/decrypting conversion method and apparatus capable of controlling dynamically cyclic shift independent of data to undergo encrypting/decrypting conversion includes two or more different fixed circulating shift processing means for shifting cyclically the data by a fixed bit number leftward or rightward, a cyclic shift processing selecting means for selecting fixed cyclic shift processing means. The selecting sequence determined by the cyclic shift processing means is determined on the basis of data for determining the shift number selecting sequence.
AbstractList The present invention relates to encryption/decryption techniques for encrypting/decrypting digital data transferred among computers, home-use-destined electric/electronic equipment and the like. Encrypting/decrypting conversion method and apparatus capable of controlling dynamically cyclic shift independent of data to undergo encrypting/decrypting conversion includes two or more different fixed circulating shift processing means for shifting cyclically the data by a fixed bit number leftward or rightward, a cyclic shift processing selecting means for selecting fixed cyclic shift processing means. The selecting sequence determined by the cyclic shift processing means is determined on the basis of data for determining the shift number selecting sequence.
Author Takaragi, Kazuo
Furuya, Soichi
Koreeda, Hiroyuki
Sasamoto, Manabu
Noguchi, Takaharu
Okamoto, Hiroo
Hirahata, Shigeru
Aikawa, Makoto
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