一个门限代理签名方案的进一步改进  

Further Improvement of a Threshold Proxy Signature Scheme

作　　者：谢琪[1] 于秀源[2] 

机构地区：[1]杭州师范学院信息工程学院,浙江杭州310036 [2]杭州师范学院理学院

出　　处：《计算机应用研究》2006年第10期103-106,共4页Application Research of Computers

基　　金：国家自然科学基金资助项目(10271037)

摘　　要：1999年,Sun等人提出了一个门限代理签名方案,克服了Zhang和K im等人分别提出的方案的缺点;近来,李继国等人指出Sun的方案无法抵抗替换公钥攻击,并给出了一个改进方案;指出李继国的方案依然无法抵抗替换公钥攻击,同时提出了代理关系转换攻击方法,成功地攻击了他们的方案。该攻击方法对设计安全的代理签名有重要的价值。最后给出了门限代理签名的进一步改进方案。In 1999, Sun, et al presented a threshold proxy signature, which overcame weaknesses of the schemes proposed by Zhang and Kim, et al, respectively. Recently, Li, et al showed that Sun＇ s scheme cann＇ t resist the public key substitution attack, and proposed an improved scheme. However, their improVed scheme is still suffer from the public key substitution attack. Additional, a proxy relationship inversion attack on Li＇ s scheme is proposed, it will provides more information in the design of secure proxy signature scheme. Finally, a further improvement scheme is proposed to eliminate the weaknesses.

关 键 词：数字签名 代理签名 门限代理签名 

分 类 号：TP309.08[自动化与计算机技术—计算机系统结构]