Ibrahim, Subariah and Maarof, Mohd. Aizaini and Salihin Ngadiman, Mohd.
(2007)
*Practical security against differential cryptanalysis of extended feistel network.*
In: Postgraduate Annual Research Seminar (PARS’ 07), 2007, UTM, Johor Bahru.

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## Abstract

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.

Item Type: | Conference or Workshop Item (Paper) |
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Subjects: | Q Science > QA Mathematics > QA75 Electronic computers. Computer science |

Divisions: | Computer Science and Information System (Formerly known) |

ID Code: | 25412 |

Deposited By: | INVALID USER |

Deposited On: | 20 May 2012 00:53 |

Last Modified: | 02 Aug 2017 06:30 |

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