International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Impossible Differential Cryptanalysis on E2

Yuechuan Wei
Ruilin Li
Ping Li
Chao Li
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Abstract: E2 is a 128-bit block cipher which employs Feistel structure and 2-round SPN in round function. It is an AES candidate and was designed by NTT. In the former publications, E2 is supposed no more than 5-round impossible differential. In this paper, we describe some 6-round impossible differentials of E2. By using the 6-round impossible differential, we first present an attack on 9-round reduced version of E2-256 without IT Function(the initial transformation) and FT-Function(the Final transformation) function.
  title={Impossible Differential Cryptanalysis on E2},
  booktitle={IACR Eprint archive},
  keywords={secret-key cryptography / Block cipher, E2, Impossible differential attack},
  note={ 14717 received 10 Apr 2010, last revised 17 Apr 2010},
  author={Yuechuan Wei and Ruilin Li and Ping Li and Chao Li},