Abstract
SC2000 is a 128-bit block cipher with key length of 128, 192 or 256 bits, developed by Fujitsu Laboratories LTD. For 128-bit keys, SC2000 consists of 6.5 rounds, and for 192- and 256-bit keys it consists of 7.5 rounds. In this paper we demonstrate two different 3.5-round differential characteristics that hold with probabilities 2-106 and 2-107. These characteristics can be used to extract up to 32 bits of the first and last round keys in a 4.5-round variant of SC2000.
This work was supported by the European Union fund IST-1999-12324 - Nessie. The information in this document is provided as is, and no warranty is given or implied that the information is fit for any particular purpose. The user thereof uses the information at its sole risk and liability.
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References
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Raddum, H., Knudsen, L.R. (2001). A Differential Attack on Reduced-Round SC2000. In: Vaudenay, S., Youssef, A.M. (eds) Selected Areas in Cryptography. SAC 2001. Lecture Notes in Computer Science, vol 2259. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45537-X_15
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DOI: https://doi.org/10.1007/3-540-45537-X_15
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