Related-key rectangle attack on 43-round SHACAL-2

  • Authors:
  • Gaoli Wang

  • Affiliations:
  • School of Mathematics and System Sciences, Shandong University, Jinan, China

  • Venue:
  • ISPEC'07 Proceedings of the 3rd international conference on Information security practice and experience
  • Year:
  • 2007

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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.