【作者】 张弦；

【导师】 彭代渊；

【作者基本信息】 西南交通大学 ， 密码学， 2007， 硕士

【摘要】 信息社会正被计算机网络及通信技术的迅猛发展推向一个新的高级阶段，政府、军事、文教、商业、金融等社会生活的各个领域都深受其影响，信息已成为一种重要的战略资源。信息安全是信息科学领域的一门重要新兴学科，它的核心技术是密码学，其中公钥密码由于其与生俱来的一些优势，扮演着越来越重要的角色。数字签名技术作为最近几年来公钥密码发展的一个新型分支，是安全电子商务和安全电子政务的关键技术。数字签名提供认证性、完整性和不可否认性，是信息安全的核心技术之一。基于身份的密码系统解决了传统公钥体制中利用公钥基础设施来管理公钥证书的复杂性和成本过高的问题，可与公钥证书基础设施密码体制形成牢固有利的互补。采用椭圆曲线上双线性映射技术的基于身份数字签名成为近几年密码学界的热点研究问题。本文的主要研究内容涉及公钥密码系统中基于身份的数字签名，包括基于身份的群签名、代理签名以及层次签名，主要成果有：1．分析与总结了现有的基于身份的签名方案，以及基于身份的特殊签名。对其中典型的方案进行了安全性以及效率方面的讨论，指出当前基于身份数字签名存在的问题及发展方向。2．提出一个新的基于身份的代理签名方案，对算法的安全性及计算效率进行了详细讨论，证明它能够满足强不可伪造以及不可否认性，并与其它方案作比较。3．在Boneh基于身份的层次加密方案基础上，构造了一个新的基于身份层次签名，利用标准模式下的样本身份模型证明其具有在适应性选择消息攻击下抵抗存在性伪造的安全性，将新方案与现有的方案从效率和内存空间占用方面进行了比较。更多还原

【Abstract】 In nowadays, information society is being pushed onto a new advanced level by computer network and communication technologies, which have made great effects on government, military affairs, culture education, and finance, etc. Information has become an important resource in our society. Information security is one of the rising subjects in information science and its core of technology is cryptology. In cryptological area, public-key cryptosystem is playing more and more important roles in the world because of its native predominance. As a new branch of public-key cryptosystem, digital signature is a key technology of the secure B2B (Business to Business) and government affair in recent years.As one of the pivotal technologies of information security, digital signature provides authentication, integrality and incontestableness. In traditional public key infrastructure (PKI) system, managing public-key certification causes problems of complexity and high cost. Fortunately, identity-based cryptography has solved these kinds of problems, and it is also a good replenisher to PKI system. Identity based signature using pairing technology on elliptical curves has become one of the pop research problems.The main research of this thesis for identity-based signature in public-key cryptography includes identity based group signature, proxy signature and hierarchical signature. The conclusion is as follows:1. This thesis analyses and sums up schemes of existing identity-based signature and identity-based special signature, discusses the security and efficiency of some typical ones, and finally points out the existing issues and developing trends of present identity-based digital signature.2. A new identity-based proxy signature scheme is advanced. After detailedly discussing on its arithmetic security and efficiency, this new scheme is proved to be strong unforgettable and undeniable with comparison with other schemes.3. A new scheme of identity-based hierarchical signature is constructed basing on the scheme of Boneh’s identity-based hierarchical encryption. This new scheme has been proved to be secure in resisting fabrication at the situation of adaptively chosen message attacks, by using sample identity model in standard model. It is also compared with the present schemes at aspects of efficiency and memory cost.更多还原