Abstract
SMS4 is a 32-round block cipher with a 128-bit block size and a 128-bit user key. It is used in WAPI, the Chinese WLAN national standard. In this paper, we present a rectangle attack on 14-round SMS4, and an impossible differential attack on 16-round SMS4. These are better than any previously known cryptanalytic results on SMS4 in terms of the numbers of attacked rounds.
This work as well as the author was supported by a British Chevening / Royal Holloway Scholarship and the European Commission under contract IST-2002-507932 (ECRYPT).
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Lu, J. (2007). Attacking Reduced-Round Versions of the SMS4 Block Cipher in the Chinese WAPI Standard. In: Qing, S., Imai, H., Wang, G. (eds) Information and Communications Security. ICICS 2007. Lecture Notes in Computer Science, vol 4861. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-77048-0_24
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DOI: https://doi.org/10.1007/978-3-540-77048-0_24
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