Saturation cryptanalysis of CLEFIA

WANG Wei1; WANG Xiao-yun2

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Saturation cryptanalysis of CLEFIA

更新时间：2024-10-14

- Saturation cryptanalysis of CLEFIA
- Issue 10, Pages: 88-92(2008)
- 作者机构：
  
  1. 山东大学密码技术与信息安全教育部重点实验室
  2. 清华大学高等研究中心
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN918.3
- Published：2008
- 稿件说明：
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WANG Wei1, WANG Xiao-yun2. Saturation cryptanalysis of CLEFIA[J]. 2008, (10): 88-92.
DOI：

WANG Wei1, WANG Xiao-yun2. Saturation cryptanalysis of CLEFIA[J]. 2008, (10): 88-92. DOI：

摘要

评估了2007年提出的分组加密算法CLEFIA抗饱和度分析的强度。指出并改正了CLEFIA的设计者Shirai等人提出的8圈区分器的错误。将白化密钥和子密钥结合

并利用分别征服策略减少需要猜测的密钥个数

采用"部分和"技术以降低时间复杂度。从而

将对10圈CLEFIA的饱和度攻击扩展到11圈的CLEFIA-128/192/256。此外

该攻击还可应用到12圈的CLEFIA-192/256和13圈的CLEFIA-256。

Abstract

The saturation attack on a novel block cipher CLEFIA

which was proposed in FSE 2007

was reevaluated.The flaws in Shirai et al’s 8 round distinguishers were pointed out and corrected.In order to reduce the number of guessed subkeys

the attack utilized the movement of the whitening key to combine it with subkey

and explored a di-vide-and-conquer strategy.The partial sum technique was adopted to reduce the time complexity.As a result

the satura-tion attack can be extended from 10 round variant without key whitenings to 11 round CLEFIA-128/192/256

and is ap-plicable to 12 round CLEFIA-192/256 and 13 round CLEFIA-256.

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