Abstract
SHACAL-2 is a 256-bit block cipher with various key sizes based on the hash function SHA-2. Recently, it was recommended as one of the NESSIE selections. Up to now, no security flaws have been found in SHACAL-2. In this paper, we discuss the security of SHACAL-2 against an impossible differential attack. We propose two types of 14-round impossible characteristics and using them, we attack 30-round SHACAL-2 with 512-bit key. This attack requires 744 chosen plaintexts and has time complexity of 2495.1 30-round SHACAL-2 encryptions.
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Hong, S., Kim, J., Kim, G., Sung, J., Lee, C., Lee, S. (2003). Impossible Differential Attack on 30-Round SHACAL-2. In: Johansson, T., Maitra, S. (eds) Progress in Cryptology - INDOCRYPT 2003. INDOCRYPT 2003. Lecture Notes in Computer Science, vol 2904. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-24582-7_7
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DOI: https://doi.org/10.1007/978-3-540-24582-7_7
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