本文選題：無證書簽名 + 密鑰托管　； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：近年來,無證書公鑰密碼體制由于其既不需要負(fù)擔(dān)繁重的公鑰證書管理又能夠很好的解決基于身份公鑰密碼體制中的密鑰托管問題而受到了學(xué)者的廣泛關(guān)注。但是現(xiàn)有的關(guān)于無證書公鑰密碼體制的方案還存在一些問題。首先現(xiàn)有的大部分方案設(shè)計(jì)都是基于隨機(jī)預(yù)言模型,而隨機(jī)預(yù)言模型是一個(gè)理想的模型,并不適合于實(shí)際運(yùn)用。其次,因?yàn)闊o證書密碼體制中沒有證書綁定用戶的公鑰并且用戶的部分私鑰是由KGC(密鑰生成中心)產(chǎn)生,所以此類方案極易受到公鑰替換攻擊和不誠信KGC攻擊。最后,大部分方案中KGC的信任等級(jí)只能達(dá)到了M.Girault信任等級(jí)定義中的等級(jí)2(KGC即使無法獲得用戶的私鑰也能夠偽裝成任何用戶進(jìn)行非法操作)。本文主要針對以上問題進(jìn)行研究,具體工作成果如下。1.對現(xiàn)有的在標(biāo)準(zhǔn)模型下的算法模型進(jìn)行研究,發(fā)現(xiàn)基于該模型設(shè)計(jì)出的方案只能達(dá)到M. Girault信任等級(jí)定義中的等級(jí)2(KGC即使無法獲得用戶的私鑰也能夠偽裝成任何用戶進(jìn)行非法操作),因此該模型是不安全的,本文對該模型進(jìn)行改進(jìn)使得方案中KGC的信任等級(jí)達(dá)到3,在此信任等級(jí)下KGC的任何偽裝活動(dòng)都能夠被發(fā)現(xiàn),從而削弱了方案中對KGC的信任依賴。2.對2012年Yu等人提出的在標(biāo)準(zhǔn)模型下的無證書公鑰簽名方案進(jìn)行分析。通過分析推導(dǎo)出該方案中存在的問題,并且通過具體的攻擊得出該方案無法抵御公鑰替換攻擊和不誠信KGC攻擊。3.基于schnorr簽名算法設(shè)計(jì)出在標(biāo)準(zhǔn)模型下安全且高效的無證書簽名方案。并且通過嚴(yán)密的理論知識(shí)證明該方案能夠抵御公鑰替換攻擊和不誠信KGC攻擊。除此之外,根據(jù)M. Girault的信任等級(jí)定義,該方案能夠達(dá)到信任等級(jí)3。
[Abstract]:In recent years, the certificateless public key cryptosystem has attracted wide attention because it can solve the key escrow problem in the identity-based public key cryptosystem because it does not have to bear the heavy burden of the public key certificate management and can solve the problem of key escrow in the identity-based public key cryptosystem. However, there are still some problems in the existing scheme of certificate-free public key cryptosystem. Firstly, most of the existing schemes are based on stochastic prophecy model, which is an ideal model and is not suitable for practical application. Secondly, because there is no certificate bound user's public key in the certificate free cryptosystem and part of the user's private key is generated by KGC (key Generation Center), this kind of scheme is vulnerable to public key replacement attack and dishonest KGC attack. Finally, the trust level of KGC in most schemes can only reach the level 2KGC in the definition of trust level of M. Girault, even if the private key of the user cannot be obtained, the KGC can still pretend to operate illegally by any user. This paper mainly aims at the above question carries on the research, the concrete work result is as follows. 1. The existing algorithm model under the standard model is studied. It is found that the scheme based on this model can only reach the level 2KGC in the definition of M.Girault trust level, even if the private key of the user can not be obtained, it can still be disguised as any user to carry out illegal operation, so the model is not safe. In this paper, the model is improved so that the trust level of KGC in the scheme reaches 3, under which any camouflage activities of KGC can be found, which weakens the trust dependency of KGC in the scheme. This paper analyzes the certificate-free public key signature scheme proposed by Yu et al in 2012 under the standard model. By analyzing and deducing the problems in the scheme, it is concluded that the scheme can not resist the public key substitution attack and the dishonest KGC attack. Based on the schnorr signature algorithm, a secure and efficient certificate free signature scheme is designed under the standard model. It is proved that the scheme can resist public key substitution attack and dishonest KGC attack through rigorous theoretical knowledge. In addition, according to M.Girault 's definition of trust level, the scheme can achieve trust level 3.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN918.91

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