投影对C^(*-)体制对称性的破坏  

Break of the C^(*-) Scheme Symmetry Caused by Projection

作　　者：袁峰[1] 胡予濮[1] 欧海文[2] 赵东[1] 

机构地区：[1]西安电子科技大学计算机网络与信息安全教育部重点实验室,陕西西安710071 [2]北京电子科技学院信息安全重点实验室,北京100070

出　　处：《华南理工大学学报（自然科学版）》2010年第5期86-89,共4页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"973"计划项目(2007CB311201);国家自然科学基金资助项目(60970119;60803149)

摘　　要：SFLASH体制是配上具体参数的C*-体制,已被Dubois等用差分攻击方法成功地攻破.文中分析了Dubois等对SFLASH体制所用的攻击方法,说明该攻击能成功的关键主要是依赖于SFLASH体制的对称性,并对C*-体制的对称性进行了研究,严格证明了投影能够破坏C*-体制的对称性.该结果表明,在SFLASH体制上应用投影方法可以有效地抵抗差分攻击.The SFLASH cryptographic scheme is a C＊-scheme with specific parameters.It has been broken by Dubois et al with differential cryptanalytic attacks.This paper reviews the basic attacks to the SFLASH scheme,and points out that a successful attack mainly depends on the symmetry of the SFLASH scheme.Moreover,the symmetry of the C＊-scheme is investigated,and the fact that projection can break the symmetry of the C＊-scheme is also strictly proved.The results indicate that the SFLASH scheme with projection can effectively withstand diffe-rential attacks.

关 键 词：密码 公钥密码 多项式 映射 多变量 对称性 投影 C＊-体制 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]