An Efficient ID-based Proxy Blind Signature Scheme

在代理签名方案中,原始签名人能将其数字签名权力委托给代理签名人。在盲签名方案中,消息和签名结果对签名人是不可见的。文章分析了目前基于身份的各种代理盲签名方案的性能和安全性,发现这些方案都假定私钥生成中心(PKG)是可信任的,但在现实环境中这个假设并不总是成立的。结合代理签名与盲签名,利用间隙Diffie-Hellman(GDH)群的特点,首次构造了一种基于身份无需可信中心的代理盲签名方案。分析表明,新方案不仅克服了已提出的代理盲签名方案不能有效抵抗伪造攻击并缺少不可链接性等缺陷,而且签名效率也有明显的提高。With proxy signature,an original signer can entrust his signing authority to a proxy signer.In blind signature scheme,a message and the signature result is unknown to the signer.Some recent ID-based proxy blind signature schemes' performance and security are analyzed.It is found that the private key generator should be assumed to be trusted.While in real environment,this assumption does not always hold.Combining proxy signature with blind signature,a new ID-based proxy blind signature scheme without trusted PKG is proposed from GDH group.Analysis shows that the new scheme overcomes the security leaks of forgery attacks and linkability in the existing ID-based proxy blind signatures.Furthermore,its efficiency is also better than the existing ones

Research on ID-based Proxy Blind Signature Scheme

信息安全是信息社会急需解决的最重要问题之一，它已成为信息科学领域的一个重要的新兴学科。数字签名技术是提供认证性、完整性和不可否认性的重要技术，因而是信息安全的核心技术之一。随着对数字签名研究的不断深入，随着电子商务、电子政务的快速发展，简单模拟手写签名的一般数字签名已不能完全满足需要，研究具有特殊性质的数字签名成为数字签名的主要研究方向。 本文的主要内容是代理盲签名方案的研究。代理盲签名作为一种新型的数字签名方案，首先是由Lin等人在2000年提出。代理盲签名兼具了代理签名和盲签名的优点，正是这一特性，使得代理盲签名可以应用到电子商务、电子货币等应用领域，具有很高的实际应用价值。 基于身份...Information security is one of the most important problems in modern information society and becomes a new important subject in the information science. Digital signature, which can prove authentication, integrity and non-repudiation, is one of the key techniques of information security. As the deepening of digital signature research and the rapid development of E-commerce and E-governance, the st...学位：工学硕士院系专业：信息科学与技术学院自动化系_控制理论与控制工程学号：X200522300

Novel certificate-based proxy blind signature

在Gentry提出的基于证书加密(CBE)概念的基础上,提出了构造基于证书签名(CBS)方案的一般性方法,并在此基础上,结合代理签名与盲签名,利用间隙Diffie-Hellman(GDH)群的特点,提出了一种基于证书的代理盲签名的新方案,分析表明该方案不仅克服了基于身份的代理盲签名方案不能有效抵抗伪造攻击并缺少不可链接性等缺陷,而且签名算法的效率也有明显提高。Based on the Certificate-Based Encryption(CBE) given by Gentry,a generic method to consturct Certificate-Based Signature (CBS) scheme is presented.Combining proxy signature with blind signature,a new certificate-based proxy blind signature scheme is proposed based on Gap Diffie-Hellman(GDH) group.Analysis shows that the new scheme overcomes the security leaks of forgery attacks and linkability in the existing identity-based proxy blind signatures.Furthermore,it also has distinct advantages in efficiency.厦门大学985二期信息创新平台项目(2004- 2007);; 福建省教委科技项目(No.JAO5290

New ID-Based Blind Signature and Proxy Signature

随着互联网电子商务等业务的迅速发展,盲签名与代理签名逐渐成为网络安全研究的热点。现有的一些盲签名与代理签名方案大多建立在可信第三方TTP的基础之上,签名能否顺利进行主要依赖于TTP,如果TTP伪造签名或受到攻击,那么签名将失效。基于椭圆曲线上的双线性对理论,提出了一类新的基于身份无需可信第三方的盲签名与代理签名方案。在CdH问题是困难的假设下,新方案被证明是安全的。在计算量方面,盲签名方案和代理签名方案各仅需两次对运算,效率比目前最好的zHAng和WAng方案高一倍。With the rapid development of e-commence and other utilities on the Internet,blind signature and proxy signature have become more important and crucial.But most current schemes depend on the trusted third party(TTP)which can forge a signature of any one.In this paper,the authors present a new ID-based blind signature scheme and a new ID-based proxy signature scheme without TTP based on the bilinear pairings.The proposed schemes are proved to be secure assuming the computational Diffie-Hellman problem is hard.As compared with the most efficient Zhang & Wang scheme to date,the proposed schemes decrease four pairing operations and only require two pairing operations for each scheme.福建省青年科技人才创新资助项目(2008F3110);国家“十一五”科技支撑计划项目(2007BAK34B04);国家自然科学基金资助项目(60704042);福建省教育厅科技项目(JA08156

Cryptanalysis and improvement of ID-based proxy blind signature scheme

通过对Li-Zhang基于双线性映射的基于身份的代理盲签名方案的分析,指出该方案并不满足不可伪造性,原始签名人可以伪造一个有效的代理盲签名,代理签名人可以滥用代理签名权,同时当签名被用户泄露后,代理签名人能将自己在签名协议中的签名和签名的消息联系起来,这就是所谓的可追踪性。在此基础上提出了改进的代理盲签名方案,改进后的方案有效克服了原方案的安全缺陷,并满足代理盲签名所需要的各种安全性要求,其计算量虽有少量增加,但仍低于其他同类方案。The security of the Li-Zhang's ID-based proxy blind signature scheme from bilinear pairings was analyzed, and it was found that this scheme did not possess the unforgeability property. The original signer can forge a valid proxy blind signature for any message, and the proxy signer can misuse the signing capabilities. At the same time, the proxy signer can make a linkage between a signature and the corresponding message of signing protocol after signing, which is called linkability. An improved proxy blind signature scheme was proposed, which can resolve the security problems existing in the original scheme and satisfy other required properties of a proxy blind signature scheme. The calculative complexity is lower than that of the other schemes despite a little increase.国家“十一五”科技支撑计划项目(2007BAK34B04);; 国家自然科学基金资助项目(60704042);; 厦门大学985二期信息创新平台项目(2004-2007

管理层收购会带来财富效应吗?——基于中国上市公司的实证研究

股权分置改革完成后,管理层收购的动机更加强烈,相关研究也再次成为理论界与实务界共同关注的热点问题。本文收集了1997-2006年间我国实施管理层收购的上市公司数据,运用事件分析法对上市公司MBO的市场效应进行考察。实证研究发现,上市公司的管理层收购没有带来显著的财富效应。表明,我国管理层收购的积极作用不明显,有关部门应该加强监管

New threshold partially blind signature scheme without trusted center

基于间隙dIffIE-HEllMAn(gdH)群的特点,首先提出了一个有效的基于身份的部分盲签名方案,能够防止私钥产生中心(Pkg)伪造签名。而后用所提的部分盲签名方案构造了基于身份的新型门限部分盲签名方案。文中的构造思想主要基于fEldMAn的可证实秘密共享方案,具有实现简单但安全性高的特点。到目前为止,该方案是第一类用双线性对来构造的基于身份的门限部分盲签名方案。分析表明,所提方案具有部分盲性、不可伪造性和强壮性等特性,是安全、有效的。An efficient ID-based partially blind signature scheme is proposed based on gap diffie-hellman group.In this scheme, the dishonest Private Key Generator(PKG) can not impersonate any user at any time.Then a new ID-based threshold partially blind signature scheme is proposed based on the ID-based partially blind signature scheme.The main idea of the scheme is based on Feldman’s verifiable secret sharing scheme which is simple to implement with high secure character.Up to now,it is the first pairing-based cryptography on ID-based threshold partially blind signature.Analysis shows that the proposed scheme is secure and effective.It has provable security properties of blindness,unforgeability and robustness.国家自然科学基金;国家“十一五”科技支撑计划项目资助;福建省青年科技人才创新项目(No.2008F3110);福建省教育厅科技项目(No.JA08156)---

Flaw and Improvement of Three Certificateless Signature Schemes

对最近提出的2个在随机预言模型中可证安全的无证书签名方案和1个在标准模型中可证安全的无证书签名方案进行安全性分析,指出这3个方案不能抵抗替换公钥攻击的安全隐患,在这种攻击下攻击者能够生成新的公钥满足合法签名者生成的合法签名。给出改进措施,有效克服原方案中的设计缺陷。The security flaws of two provably-secure certificateless signature schemes in the random oracle model and a provably-secure certificateless signature scheme in the standard model are analyzed.It is found that the three schemes are all insecure against public key replacement attack.In this attack,an adversary can generate a new public key satisfying legitimate signatures created by the legitimate signer.In order to avoid these flaws,an improvement measure is proposed,which can resolve the security problems existing in the original schemes.国家自然科学基金资助项目(60704042);国家“十一五”科技支撑计划基金资助项目(2007BAK34B04);福建省教育厅科技基金资助项目(JA08156);福建省青年科技人才创新基金资助项目(2008F3110

对价支付影响因素的理论和实证分析

我国上市公司股权分置改革成功与否关系我国证券市场未来的发展。本文根据财务理论,结合国情构建6个研究假设,并以330家实施股权分置改革的上市公司为样本,应用实证研究方法,探讨非流通股东的对价送出率及流通股东的对价送达率的影响因素。研究发现股改工作中所采用的市场化博弈机制可在一定程度上保障对价方案的合理性和两类股东的利益,但仍存在诸如机构投资者未发挥议价能力等问题