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Block cipher algorithm having a robust security against differential cryptanalysis, linear cryptanalysis and higher-order differential cryptanalysis
Block cipher algorithm having a robust security against differential cryptanalysis, linear cryptanalysis and higher-order differential cryptanalysis
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机译：具有针对差分密码分析，线性密码分析和高阶差分密码分析的强大安全性的分组密码算法
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摘要
The present invention relates to the block cipher algorithm based on the prior Feistel type block cipher algorithm (or similar to DES algorithm). Usually the security of Feistel type block cipher algorithm depends on the structure of its round function. More specifically, the present invention relates to the round function structure of the Feistel type block cipher algorithm, in the instance that the round input data block is divided into 8-bit blocks and the divided sub-blocks are fed, with the combined output data of the previous S-box, into 2568 S-box, except for the first input sub-data block. The first sub-data block one is directly fed into the first S-box. The total output data block, after these steps, is rotated by 8-bits and this rotated result is the output of the current round function.
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