Abstract
We present improved Square attacks against the NESSIE and ECTP candidate block ciphers Hierocrypt-3 and Hierocrypt-L1, designed by Toshiba. We improve over the previous best known attack on five S-box layers of Hierocrypt-3 by a factor of 2128 computational steps with an attack on six layers for 128-bit keys, and extend it to seven S-box layers for longer keys. For Hierocrypt-L1 we are able to improve previous attacks up to seven S-box layers (out of twelve).
Cite
CITATION STYLE
Barreto, P. S. L. M., Rijmen, V., Nakahara, J., Preneel, B., Vandewalle, J., & Kim, H. Y. (2002). Improved square attacks against reduced-round hierocrypt. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 2355, pp. 165–173). Springer Verlag. https://doi.org/10.1007/3-540-45473-X_14
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