共查询到17条相似文献,搜索用时 109 毫秒
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无证书的签名体制解决了传统公钥密码体制中的证书管理问题和基于身份密码体制中的密钥托管问题。代理签名允许原始签名者将自己的签名权委托给代理签名人。指定多个验证者签名方案允许签名者指定多个签名的验证者,只有这些指定的验证者们可以验证签名的有效性,但他们却不能向其他人证明这一事实。结合这三者的优势提出了无证书的指定多个验证者代理签名方案和其要满足的安全要求,并对其安全性做了分析,分析表明该方案满足无证书的指定多个验证者代理签名方案所要满足的安全要求,适于实际应用。 相似文献
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无证书广义指定多个验证者有序多重签名 总被引:2,自引:0,他引:2
有序多重签名方案一般都是基于离散对数或身份的,存在着证书管理问题或是密钥托管问题。广义指定多个验证者签名体制允许签名的持有者指定多个签名的验证者,只有被指定的验证者可以验证签名的有效性。将无证书签名体制和广义指定多个验证者签名体制相结合,提出了无证书广义指定多个验证者有序多重签名方案及其安全模型。在随机预言模型下的安全性分析表明:该方案可以抵抗适应性选择消息攻击,其不可伪造性基于BDH困难假设。 相似文献
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无证书强指定验证者签名,能够很好地解决传统密码体制下强指定验证者签名证书管理复杂问题和基于身份密码体制下强指定验证者签名的密钥托管问题,因此研究无证书强指定验证者签名具有重要的理论意义。提出了一个无证书强指定验证者签名方案。基于CDH(Computational Diffie Hellman)问题和CBDH(Computational Bilinear Diffie-Hellman)问题困难假定,在随机预言模型下证明了该方案对自适应选择消息攻击是存在不可伪造的,分析表明该方案具有较小的计算代价和通信代价。 相似文献
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Li-Wang(2006)提出了一种通用指定验证者环签名方案(UDVRS)。该方案允许签名者指定一个验证者并产生一个指定验证者环签名,使得只有指定验证者才能验证该环签名。通过对Li-Wang提出的通用环签名方案进行分析,指出了该方案并不满足指定验证者性质,给出了攻击方法。为避免该缺陷,对Li-Wang通用指定验证者环签名方案进行改进,改进后的方案是可证安全的。 相似文献
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已有的定向代理签名方案,大都是基于证书公钥密码体制或基于身份密码体制的,都存在证书管理问题或密钥托管问题。为了保护签名接收人的隐私,基于无证书密码体制的优点,提出一种新的无证书定向代理签名方案。在该方案中,代理签名人可以代理原始签名人生成针对指定接收人的定向代理签名,只有原始签名人指定的接收人才可以验证签名的有效性。相比已有方案,新方案不存在证书管理和密钥托管的问题,安全性得到了提高。分析表明,新方案满足定向代理签名的所有性质,适合于实际应用。 相似文献
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指出樊睿等人的基于无证书的代理签名方案和明洋等人的基于无证书的广义指定验证者签名方案都无法抵抗替换公钥攻击,同时樊睿等人的方案也无法抵抗原始签名人改变攻击,攻击者可以伪造一个他授权代理签名人对相同消息的代理签名,此外,还指出明洋等人在安全性证明中将重放技术直接应用在无证书环境中是不正确的。通过将代理授权证书和用户的公钥作为密码哈希函数的输入,使攻击者无法替换用户的公钥及更改代理授权证书,改进方案有效提高了原方案的安全性,同时保留了原方案的其他优点。 相似文献
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限定验证者签名可以同时实现传统数字签名签名者身份的认证和保密,满足特殊场合的需要。提出了一个新的无证书可转换限定验证者签名,新方案满足无证书可转换限定验证签名的安全性要求,并在随机预言机模型和CDH困难问题假设下证明了新方案是安全的。从计算效率上分析表明新方案在签名阶段没有双线性对运算,明显优于Wu等人的无证书限定验证者签名方案。 相似文献
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Feng Cao Author Vitae Author Vitae 《Journal of Systems and Software》2009,82(4):643-649
Universal designated verifier signature was first introduced by Steinfeld, Bull, Wang and Pieprzyk in Asiacrypt 2003. In the universal designated verifier signature scheme, any holder of a signature can designate the signature to any desired designated verifier, such that only the designated verifier will believe that the signature holder holds a valid signature. In SecUbiq’05 [Zhang Fangguo, Susilo Willy, Mu Yi, Chen Xiaofeng, 2005. Identity-based universal designated verifier signatures. In: The First International Workshop on Security in Ubiquitous Computing Systems, Nagasaki, Japan, LNCS 3823. Springer-Verlag, Berlin, pp. 825-834] first extended this notion to the identity based setting and proposed two identity based universal designated verifier signature schemes. However, the security of their scheme is based on the random oracle model. Up to now, there is no provably secure identity based universal designated verifier signature scheme in the standard model. In this paper, we propose the first identity based universal designated verifier signature scheme whose security can be proven in the standard model based on the hardness of the computational Diffie-Hellman (CDH) problem. 相似文献
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Seung-Hyun Seo Jung Yeon Hwang Kyu Young Choi Dong Hoon Lee 《Computer Standards & Interfaces》2008,30(5):288-295
An identity-based (ID-based) universal designated verifier signature (ID-UDVS) scheme allows a signature holder to designate a specific verifier of the signature by using a simplified public identity such as e-mail address. In the paper, we present an efficient identity-based universal designated multi-verifiers signature (ID-UDMVS) scheme by extending a single verifier to a set of multi-verifiers for verification of a signature. To achieve our goal, we construct an ID-based signature scheme providing batch verification and then, using this scheme as a building block, we firstly propose an ID-UDMVS scheme with constant signature size. Interestingly our construction method can be used as a generic method transforming an ID-UDVS scheme, which is defined in a bilinear version of the so-called ∑ protocol, to an ID-UDMVS scheme. 相似文献
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A strong designated verifier signature scheme makes it possible for a signer to convince a designated verifier that she has signed a message in such a way that the designated verifier cannot transfer the signature to a third party, and no third party can even verify the validity of a designated verifier signature. We show that anyone who intercepts one signature can verify subsequent signatures in Zhang-Mao ID-based designated verifier signature scheme and Lal-Verma ID-based designated verifier proxy signature scheme. We propose a new and efficient ID-based designated verifier signature scheme that is strong and unforgeable. As a direct corollary, we also get a new efficient ID-based designated verifier proxy signature scheme. 相似文献
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Baoyuan Kang Author Vitae Colin Boyd Author Vitae 《Journal of Systems and Software》2009,82(2):270-273
Unlike ordinary digital signatures, a designated verifier signature scheme makes it possible for a signer to convince a designated verifier that she has signed a message in such a way that the designated verifier cannot transfer the signature to a third party. In a strong designated verifier signature scheme, no third party can even verify the validity of a designated verifier signature, since the designated verifier’s private key is required in the verifying phase. Firstly, this paper proposes the model of identity-based strong designated verifier signature scheme based on bilinear pairings by combining identity-based cryptosystem with the designated verifier signature scheme, and then, provides one concrete strong identity-based designated verifier signature scheme, which has short size of signature, low communication and computational cost. We provide security proofs for our scheme. 相似文献