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.%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Feistel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.
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