共查询到17条相似文献,搜索用时 93 毫秒
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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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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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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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高效的无证书有序多重签名方案 总被引:2,自引:0,他引:2
针对分布式环境下信任建模中信任链上推荐信息的认证问题,研究了无证书有序多重签名方案的安全模型,进而基于椭圆曲线密码和双线性映射提出一个无证书有序多重签名方案,并在随机预言机模型下,证明方案的安全性建立在计算 Diffie-Hellman 问题的困难性上。该方案无需证书管理中心,多重签名的长度与单用户的签名长度相当,与签名人数无关,在部分签名阶段不需双线性对运算,在部分签名及整体签名的验证阶段都只需一个双线性对运算,与同类方案相比,具有运行效率上的优势,可方便地应用于大规模分布式环境下信任传播的过程中。 相似文献
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提出了一个高效的无证书盲签名方案。在随机预言机模型下,证明了新方案在适应性选择消息、选择身份攻击下是存在不可伪造的,能够有效抵抗AI攻击者的替换公钥攻击和AⅡ攻击者的KGC攻击。方案中在签名阶段没有任何双线性对运算,在验证阶段只有一个双线性对运算,并且不需要使用映射到点(Mapto Point)的特殊哈希函数。与已有方案相比,所提方案在计算量上更具优势。同时方案采用无证书公钥密码体制,解决了基于证书签名方案的证书管理问题和基于身份签名方案的密钥托管问题。 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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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 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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验证者要知道一个证实数字签名的有效性,必须得到一个称为证实者的第三方的帮助与合作。签名者的安全性和证实签名的“不可见性”是一个证实数字签名方案必须具备的两个重要特性。现存的证实签名实现方案,或者是低效的,或者是不安全的。本文首次基于ElGamal签名机制提出一种新的证实数字签名方案,分析表明,该方案是一种安全而高效的证实数字签名实现方案。 相似文献
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JuHee Ki Jung Yeon Hwang DaeHun Nyang Beom‐Hwan Chang Dong Hoon Lee Jong‐in Lim 《ETRI Journal》2012,34(2):235-244
An identity‐based strong designated verifier signature scheme provides restricted verifiability only for a verifier designated by a signer and proper privacy for the signer. In this paper, we show that strong designated verifier signature schemes do not satisfy the self‐unverifiability requirement in the sense that not only exposure of the verifier's secret key but also of the signer's secret key enables an attacker to verify signatures, which should have been the exclusive right of the verifier. We also present a generic method to construct a strong identity‐based designated verifier signature scheme with self‐unverifiability from identity‐based key encapsulation and identity‐based key sharing schemes. We prove that a scheme constructed from our method achieves unforgeability, non‐transferability, and self‐unverifiability if the two underlying components are secure. To show the advantage of our method, we present an example that outputs short signatures and we analyze its performance. 相似文献