Differential cryptanalysis of eight-round SEED

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Block Cipher SEED is one of the standard 128-bit block ciphers of ISO/IEC together with AES and Camellia (Aoki et al., 2000, ISO/IEC 18033-3, 2005; Korea Information Security Agency, 1999; National Institute of Standards and Technology, 2001) [1,4-6]. Since SEED had been developed, there is no distinguishing cryptanalysis except a 7-round differential attack in 2002 [7]. For this, they used the six-round differential characteristics with probability 2-124 and analyzed seven-round SEED with 2126 chosen plaintexts. In this paper, we propose a new seven-round differential characteristic with probability 2-122 and analyze eight-round SEED with 2125 chosen plaintexts. The attack requires about 2 122 eight-round encryptions. This is the best-known attack on a reduced version of SEED so far.

Original languageEnglish
Pages (from-to)474-478
Number of pages5
JournalInformation Processing Letters
Issue number10
StatePublished - 30 Apr 2011


  • Block cipher
  • Cryptanalysis
  • Cryptography
  • SEED


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