Abstract
SHACAL-2 is a 256-bit block cipher with up to 512 bits of key length based on the hash function SHA-2. It was recommended as one of the NESSIE projection selections. As far as the number of the attacked rounds is concerned, the best cryptanalytic result obtained on SHACAL-2 so far is the analysis of a related-key rectangle attack on the 42-round SHACAL-2 [13]. In this paper we present a related-key rectangle attack on 43-round out of the 64-round of SHACAL-2, which requires 2240.38 chosen plaintexts and has time complexity of 2480.4 43-round SHACAL-2 encryptions. In this paper we also identify and fix some flaws in previous attack on SHACAL-2.
Supported by National Natural Science Foundation of China Key Project No.90604036, National Outstanding Young Scientist No.60525201 and 973 Program No.2007CB807902.
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Wang, G. (2007). Related-Key Rectangle Attack on 43-Round SHACAL-2. In: Dawson, E., Wong, D.S. (eds) Information Security Practice and Experience. ISPEC 2007. Lecture Notes in Computer Science, vol 4464. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-72163-5_4
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