论文标题:不可否认签名与代理签名的应用研究
Study on the Applications of Undeniable Signature and Proxy Signature
论文作者 王长林
论文导师 胡予濮,论文学位 硕士,论文专业 密码学
论文单位 西安电子科技大学,点击次数 459,论文页数 69页File Size1264k
2003-01-01论文网 http://www.lw23.com/lunwen_69233892/ 不可否认签名; 指定证实人签名; 代理签名
Undeniable Signature; Designated Confirmer Signature; Proxy Signature
本文主要研究了不可否认签名体制和代理签名体制，作者主要的研究内容及成果如下：1) 介绍基本的数字签名体制及对数字签名体制的各种攻击。在随机问答器模型下讨论了签名具有某种特定形式的签名体制的安全性。作为一个例子，证明了Schnorr签名在随机问答器模型下对自适应选择消息攻击的安全性。2) 引入不可否认签名的概念和模型，说明其存在的应用。介绍了已有的基于离散对数和RSA的不可否认签名体制，分析了它们的安全性质；引入指定证实人签名的概念和模型，介绍了一种构造指定证实人签名体制的方法，并依照构造方法提出了一种安全的指定证实人签名体制，证明了新体制的安全性。3) 引入代理签名概念、分类及需要满足的安全性质。介绍了基本的代理签名体制、强壮的非指定代理签名体制和代理签名人身份保密的代理签名体制，分析了它们具有的安全性质。结合实际应用提出了一种更合理、更高效的不需要可信第三方的代理签名人身份保密的代理签名体制，并指出新体制相比已有体制的优点。
This thesis mainly discusses undeniable signature schemes and proxy signature schemes. The main contents and results that the author obtained are as follows:1. We introduce some basic digital signature schemes and several kinds of attacks the enemy can mount against a digital signature scheme. The security of the signature schemes whose signatures have specific form is discussed in the random oracle model. As an example, we proof the security of Schnorr signature against adaptive chosen message attack in the random oracle model.2. We introduce the notion and model of undeniable signature and show its applications available. Undeniable signature schemes based on the problems of discrete logarithm and RSA are given and their security is analyzed. We then introduce the notion and model of designated confirmer signature. A method to contruct designated confirmer signature scheme is given. Using this method we propose a new secure designated confirmer signature scheme and proof its security.3. We introduce the notion and taxonomy of proxy signature as well as its security properties needed. We specify the schemes of basic proxy signature, strong non-designaed proxy signature and strong proxy signature with proxy signer privacy protection. Their security properties are analyzed. A strong proxy signer protected proxy signature scheme without an authority, which is more reasonable and more efficient, is proposed. We also point out its advantages over original schemes.
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