Cryptology ePrint Archive: Report 2010/201

Impossible Differential Cryptanalysis on E2

Yuechuan Wei and Ruilin Li and Ping Li and Chao Li

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.

Category / Keywords: secret-key cryptography / Block cipher, E2, Impossible differential attack

Date: received 10 Apr 2010, last revised 25 Sep 2010, withdrawn 25 Sep 2010

Contact author: wych004 at 163 com

Available format(s): (-- withdrawn --)

Version: 20100926:012706 (All versions of this report)

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