A Real-World Attack of 8-Round CLEFIA

TANG Xue-hai; SUN Bing; LI Chao

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A Real-World Attack of 8-Round CLEFIA

更新时间：2025-07-16

- A Real-World Attack of 8-Round CLEFIA
- Acta Electronica Sinica Vol. 39, Issue 7, Pages: 1608-1612(2011)
- 作者机构：
  
  国防科技大学数学与系统科学系,湖南,长沙,410073
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN918.1
- Published：2011
- 稿件说明：
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TANG Xue-hai, SUN Bing, LI Chao. A Real-World Attack of 8-Round CLEFIA[J]. Acta Electronica Sinica, 2011, 39(7): 1608-1612.
DOI：

TANG Xue-hai, SUN Bing, LI Chao. A Real-World Attack of 8-Round CLEFIA[J]. Acta Electronica Sinica, 2011, 39(7): 1608-1612. DOI：

摘要

CLEFIA算法是SONY公司在2007年的快速软件加密大会上提出的一个分组密码算法.研究了CLEFIA算法的等价结构

并找到了它的一个5轮区分器.基于5轮区分器

利用中间相遇攻击方法对6/7/8轮的CLEFIA算法进行了攻击.攻击复杂度都比较小

其中对于6轮和7轮的攻击在普通PC机上不到1秒钟就可恢复密钥

8轮的攻击在高性能计算机上也是可以实现的.

Abstract

CLEFIA is a block cipher proposed in FSE (Fast Software Encryption) 2007 by SONY Corporation.Some 5-round distinguishers of CLEFIA are presented according to study an equivalent structure of CLEFIA.Based on the 5-round distinguishers

some meet-in-the-middle attacks can be made on 6/7/8-round CLEFIA.The attack complexities are low enough and the key of 6/7-round CLEFIA can be recovered within one second in the ordinary PC.Moreover

the 8-round attack can be also implemented in the high-performance computer.

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