中文摘要：

CLEFIA是由SONY公司最近开发研制的一种高效率,高度安全的分组加密算法.该算法采用广义Feis-tel结构,本文给出了CLEFIA的一个等价结构图,把碰撞攻击和Square攻击的思想相结合成功分析了6轮CLEFIA,在普通PC机上两个小时之内即可完全恢复密钥.

英文摘要：

CLEFIA is an efficient,highly secure block cipher which is proposed by SONY corporation recently.CLEFIA employs a generalized Feistel structure which contains 4-branch data lines.This paper presents an equivalent structure of CLEFIA.By adopting Collision-Square attack,we recover the key of 6 round successfully within 2 hours in the ordinary PC.