发明名称 |
ENCRYPTION DEVICE, ENCRYPTION METHOD, AND COMPUTER PROGRAM |
摘要 |
<p>The invention realizes a high-security cryptographic processing apparatus that increases difficulty in analyzing its key and a method therefor. In Feistel-type common-key-block cryptographic processing that repeatedly executes an SPN-type F-function having the nonlinear conversion section and the linear conversion section over a plurality of rounds, Linear conversion processing of an F-function corresponding to each of the plurality of rounds is carried out by linear conversion processing that applies square MDS (Maximum Distance Separable) matrices. The invention uses a setting that arbitrary m column vectors included in inverse matrices of square MDS matrices being set up at least in consecutive even-numbered rounds and in consecutive odd-numbered rounds, respectively, constitute a square MDS matrix. This structure realizes cryptographic processing whereby resistance to linear cryptanalysis attacks in the common-key-block cipher is improved.</p> |
申请公布号 |
HK1096758(A1) |
申请公布日期 |
2010.04.09 |
申请号 |
HK20070101567 |
申请日期 |
2007.02.09 |
申请人 |
SONY CORPORATION |
发明人 |
SHIRAI, TAIZO;BART, PRENEEL |
分类号 |
G09C |
主分类号 |
G09C |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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