Practical security against differential cryptanalysis of extended feistel network
Immunity against differential cryptanalysis is an important measure in designing symmetric ciphers. Practical security is a measure to evaluate this immunity by estimating the minimum number of differential active s-boxes. A cipher with more s-boxes is said to have better immunity against differenti...
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| Main Authors: | , , |
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| Format: | Conference or Workshop Item |
| Published: |
2007
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| Subjects: | |
| Online Access: | http://eprints.utm.my/id/eprint/25412/ |
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| Summary: | Immunity against differential cryptanalysis is an important measure in designing symmetric ciphers. Practical security is a measure to evaluate this immunity by estimating the minimum number of differential active s-boxes. A cipher with more s-boxes is said to have better immunity against differential cryptanalysis. In this paper, we evaluate the immunity of three types of Extended Feistel Network (EFN) with Substitution-Permutation (SP) round function and compare it with a balanced Feistel Network (FN). Weight-Based Representation (WBR) of sub-blocks is employed in estimating the minimum number of s-boxes of these cipher structures. The result shows that EFN Type-II and EFN Type-III have better immunity to differential cryptanalysis than a balanced FN. This is due to a difference cancellation that occurs more often in a balanced FN. |
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