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.
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.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2011年第7期1608-1612,共5页
Acta Electronica Sinica
基金
国家自然科学基金(No.60803156
No.61070215)
