共查询到18条相似文献,搜索用时 46 毫秒
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现有的广义指定验证者签名方案的安全性大都是在随机预言机模型下证明的,但是在该模型下的可证安全并不意味着在现实中是安全的.基于Zhang等人提出的无随机预言机模型下的短签名方案,提出了一个在标准模型下可证安全的广义指定验证者签名方案,其强不可伪造性基于k+1平方根假设和指数知识假设,证明了提出方案在选择公钥和选择消息攻击下是无条件不可传递的.方案的签名长度为1366 bits,比现有方案的签名长度要短. 相似文献
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Joonsang Baek等人提出了一种新型的广义指定验证者签名(UDVS)称为广义指定验证者签名证明(UDVSP).本文提出一个高效的基于Zhang-Safavi—Susilo(ZSS)签名方案的广义指定验证者签名证明.利用双线性对的性质和预计算,所提方案中仅仅需要2个对运算,同时只使用通常密码学上的hash函数,而不需要特殊的hash函数(映射到点).在随机预言机模型中,证明该方案是安全的. 相似文献
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无证书的聚合签名的提出是为了解决密钥托管问题以及复杂的证书管理问题.然而在无证书的聚合签名中,一旦某一签名者的密钥发生泄漏,所有由此签名者参与生成的聚合签名都将不再安全.为了减小无证书的聚合签名中密钥泄漏带来的危害,本文首次将密钥隔离安全机制嵌入到无证书的聚合签名中,提出了密钥隔离的无证书聚合签名的概念和安全模型,并给出了一个实用的方案,通过与协助器的交互,实现了对签名者密钥的定时更新.同时证明了方案在随机预言机模型下是安全的,即,满足密钥隔离安全、强密钥隔离安全和安全密钥更新的性质. 相似文献
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Certificateless aggregate signature(CLAS) schemes with universal designated verifier had been widely applied in resource-constrained wireless mobile networks,because they could not only solve the problems of the certificate management and private key escrow,but also realize batch validation and the signer’s privacy protection.A security analysis for a certificateless aggregate signature scheme with universal designated verifier was firstly provided,and two attack methods to demonstrate that their scheme was forgeable was presented.To enhance security,a new certificateless aggregate signature scheme with universal designated verifier was proposed,and then the security of the scheme in the random oracle model was proved.The performance of our proposed scheme was finally evaluated.Compared with the original scheme,the pvoposed scheme fixes the security flaws and the total computational cost is greatly reduced. 相似文献
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Certificateless universal designated verifier signature schemes 总被引:2,自引:0,他引:2
Universal designated verifier signature schemes allows a signature holder to designate the signature to a desire designated verifier, in such a way that only designated verifier can verify this signature, but is unable to convince anyone else of this fact.The previous constructions of universal designated verifier signature rely on the underlying public key infrastructure, that needs both signers and verifiers to verify the authenticity of the public keys, and hence, the certificates are required.This article presents the first model and construction of the certificateless universal designated verifier signature scheme, in which the certificates are not needed.The proposed scheme satisfies all the requirements of the universal designated verifier signature in the certificateless system.Security proofs are provided for the scheme based on the random oracle model, assuming that the Bilinear diffie-hellman (BDH) problem is hard to solve. 相似文献
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为了满足在司法行政、电子政务等领域的应用需求,提出了无证书强指定验证者多重签名的概念和敌手模型,利用双线性对构造了第一个无证书强指定验证者多重签名方案,在计算双线性Diffie-Hellman问题和计算Diffie-Hellman问题假设下证明了该方案是存在性不可伪造的,而且该方案满足强指定验证者签名和多重签名应具备的性质。方案执行效率高,生成的指定验证者多重签名长度仅为160 bit,签名验证时需要的双线性对运算个数是固定的,仅需一个双线性对。所以,即使在计算资源与网络带宽受限的无线网络中方案也非常实用。 相似文献
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Certificateless aggregate signature (CLAS) schemes have been widely applied in resource-constrained wireless mobile networks,because they could not only realize batch validation but also solve the certificate management and key escrow problems.It was shown that a certificateless aggregate signature in an anonymous roaming authentication scheme was vulnerable to the signature forge attack.To address the issue,a new secure and efficient certificateless aggregate signature scheme was presented,which required no bilinear pairing operations.And then the security of the scheme under the ECDLP assumption in the random oracle model was proved.Finally the performance of proposed scheme was evaluated.Compared with the original scheme,the proposal is more secure and the total computational cost is greatly reduced . 相似文献
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基于属性的密码体制是基于身份密码体制的泛化和发展,它将身份扩展为一系列属性的集合,具有更强的表达性,并且拥有相同属性的成员自动组成一个环,便于隐匿签名者身份。通过对现有的基于属性门限环签名方案的深入分析,发现这些方案虽然满足匿名性要求,但拥有互补属性的恶意用户可以通过合谋伪造出有效签名。为弥补上述缺陷,首先给出基于属性门限环签名的不可伪造性、不可区分性及抗合谋攻击性的形式化定义,然后给出一个基于属性的抗合谋攻击可变门限环签名方案,其安全性可归约为CDH(computational Diffie-Hellman)困难问题。所提方案通过在用户属性密钥中引入互不相同的秘密随机因子的方法,防止合谋攻击者利用组合私钥的方式伪造签名。在随机预言机模型下,方案被证明能够抵抗适应性选择消息的存在性伪造及合谋攻击,并具有相同签名属性集用户间的不可区分性。与同类方案相比,新方案还具备更高的运算效率。 相似文献