Improved related-key impossible differential attacks on reduced-round AES-192

Authors:
Wentao Zhang;Wenling Wu;Lei Zhang;Dengguo Feng
Affiliations:
State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing, P.R. China;State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, P.R. China;State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, P.R. China;State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, P.R. China
Venue:
SAC'06 Proceedings of the 13th international conference on Selected areas in cryptography
Year:
2006

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Abstract

In this paper, we present several new related-key impossible differential attacks on 7- and 8-round AES-192, following the work of Eli Biham et al. [6] and Jakimoski et al. [10]. We choose another relation of the related keys, start attacks from the very beginning (instead of the third round in [6]) so that the data and time complexities are improved largely, and only two related keys are needed instead of 32 in the attacks of [6]. Furthermore, we point out and correct an error in [6] when they attacked 8-round AES-192, then present our revised attacks. Finally, we give a new related-key differential attack on 7-round AES-192, which mainly uses a property of MixColumns operation of AES.