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How to Obtain the Missing Terms of Reduced-Round DES

Abstract— In this paper, we obtain the missing IV terms of round function of DES, so that we can obtain the distinguishers of reduced-round DES. We apply the IV representation to reduced-round DES, so that the missing terms can be obtained. The missing IV terms can be exploited as the integral distinguishers because sum over any missing IV term is zero. This is the first time to construct integral distinguishers on reduced round DES.

Index Terms— Missing Terms, IV representation, Integral Distinguisher, DES, Block Cipher.

Lei Zhang, Zhaohui Liu, Weihua Hu, Juan Li, Lei Shi
China Information Technology Security Evaluation Center, CNITSEC, CHINA

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Cite: Lei Zhang, Zhaohui Liu, Weihua Hu, Juan Li, Lei Shi, "How to Obtain the Missing Terms of Reduced-Round DES," Proceedings of 2019 the 9th International Workshop on Computer Science and Engineering, pp. 734-737, Hong Kong, 15-17 June, 2019.