北京邮电大学学报
北京郵電大學學報
북경유전대학학보
JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS
2009年
5期
124-127
,共4页
公钥密码%密码学分析%多变量%数字签名%中等域扩张型
公鑰密碼%密碼學分析%多變量%數字籤名%中等域擴張型
공약밀마%밀마학분석%다변량%수자첨명%중등역확장형
public key cryptography%cryptanalysis%multivariate%digital signature%medium-field ex-tension
针对目前已知的大多数多变量公钥签名方案都处于攻击之下的事实,对多变量公钥签名的一般模型进行分析,提出一种改进结构.通过借助另一秘密仿射变换,使公钥多项式并非像在原模型中直接对应于私钥合成,进而隐藏要签名的消息值,以减少攻击者所能获得的信息量,增强抗攻击能力.理论分析表明,改进的模型可以有效提高签名方案的安全性.最后,以中等域扩张型(MFE)多变量密码系统为例进行说明.
針對目前已知的大多數多變量公鑰籤名方案都處于攻擊之下的事實,對多變量公鑰籤名的一般模型進行分析,提齣一種改進結構.通過藉助另一祕密倣射變換,使公鑰多項式併非像在原模型中直接對應于私鑰閤成,進而隱藏要籤名的消息值,以減少攻擊者所能穫得的信息量,增彊抗攻擊能力.理論分析錶明,改進的模型可以有效提高籤名方案的安全性.最後,以中等域擴張型(MFE)多變量密碼繫統為例進行說明.
침대목전이지적대다수다변량공약첨명방안도처우공격지하적사실,대다변량공약첨명적일반모형진행분석,제출일충개진결구.통과차조령일비밀방사변환,사공약다항식병비상재원모형중직접대응우사약합성,진이은장요첨명적소식치,이감소공격자소능획득적신식량,증강항공격능력.이론분석표명,개진적모형가이유효제고첨명방안적안전성.최후,이중등역확장형(MFE)다변량밀마계통위례진행설명.
Since most of the known multivariate public key signature schemes are under attacks, an improved signature model is proposed by analyzing the structure of the classical model. The method to redesign the model is to add another secret transformation so that the public key polynomials are not corresponding to the composition of the private keys, that is not the case in classical model, and the message value is hidden, then the amount of information obtained by attacker are reduced, and the scheme performance against attacks is enhanced. Analysis shows that the improved model can strengthen the security of various multivariate signature schemes. Finally, medium-field extension (MFE) multivariate cryptosystem is taken as an example to illustrate the idea.