Etsuko Tsujihara

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This paper reports impossible differential cryptanalysis on the 128-bit block cipher CLEFIA that was proposed in 2007, including new 9-round impossible differentials for CLEFIA, and the result of an impossible differential attack using them. For the case of a 128-bit key, it is possible to apply the impossible differential attack to CLEFIA reduced to 12(More)
This paper reports impossible differential cryptanalysis on the 128-bit block cipher CLEFIA that was proposed in 2007. It is known that there are the 9-round impossible differentials in CLEFIA. This paper presents the several results of impossible differential attacks using multiple impossible differentials. For key lengths of 128, 192 and 256 bits, it is(More)
This paper presents the results of three kinds of side-channel attacks, experimentally made against software-implemented ciphers on INSTAC-8 Compliant Board. INSTAC-8 is the standard evaluation platform, newly designed by the Information Technology Research and Standardization Center (INSTAC; a division of Japan Standards Association), to test Side-channel(More)
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