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J. KIMS Technol > Volume 14(2); 2011 > Article
Journal of the Korea Institute of Military Science and Technology 2011;14(2):238-245.
DOI: https://doi.org/10.9766/KIMST.2011.14.2.238   
A Study on a S Box Redesign using DES Key Expansion
Jun Lee
Korea Air Force Academy
DES 키 확장을 이용한 S Box 재설계에 관한 연구
이준
공군사관학교
Abstract
We suggest a DES key expansion algorithm which is strong enough to overcome Differential Cryptanalysis(DC) and Linear Cryptanalysis(LC). Checking the weak points of DES, we found that the opened S box provide all information on the various kinds of attack. Using the key expansion we redesigned the S box which is not open to anybody who has no key. DC and LC can not be applied to the suggested algorithm without the redesigned S box information. With the computer experiments we show that the efficiency of this algorithm is almost the same as that of DES with respect to the crypto speed.
Key Words: DES, S Box, Differential Cryptanalysis, Linear Cryptanalysis


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