Universiti Teknologi Malaysia Institutional Repository

Practical security against differential cryptanalysis of extended feistel network

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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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)
Subjects:Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions:Computer Science and Information System
ID Code:25412
Deposited On:20 May 2012 00:53
Last Modified:02 Aug 2017 06:30

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