【作者】 王波；

【导师】 王尚平；

【作者基本信息】 西安理工大学 ， 应用数学， 2007， 硕士

【摘要】 数字签名是保证数据交换的完整性、发送信息的不可否认性、交易者身份的确定性的一种有效的解决方案。基于不同的应用背景，各种特殊的数字签名使得数字签名的理论和应用研究日益深入和广泛。本文在对基于身份的数字签名、指定验证者数字签名和盲数字签名研究的基础上，重点研究了代理数字签名，主要工作如下：分析了代理数字签名的应用背景，分析了现有的代理数字签名方案及其安全模型，分析了一般代理数字签名的构建方法和安全模型。研究分析了基于身份的数字签名、指定验证者数字签名、盲签名的背景和一些现有的方案。构造了一个基于身份的指定验证者代理签名方案。新方案具有基于身份的特性，可以克服基于证书的密码系统中烦琐的密钥保管问题。并把指定验证者签名和代理签名相结合，可以防止原始签名者的伪造和由于指定验证者故意泄露验证私钥而让其他人具有验证签名的权利。对Amit代理保护盲签名方案进行改进，克服了原方案中存在的安全缺点。同时构造了一个基于椭圆曲线的代理保护盲签名方案。更多还原

【Abstract】 Digital signature is an effective solution to assure the integrality of data changing, non-reputation of sending message and deterministic of parties. Many special digital signatures based on different backgroud deeped the theory and appliance research of digital signatures. This paper focuses on proxy signatures, meanwhile, some basic research on ID-based signatures, desiganted verifier signatures and blind signatures were done. The main contributions are as follows:Analysing delegate signatures’ applied background in detail, the existing schemes and security modle and normal delegate signatures are analysed. And some schemes of ID-based signatures, desiganted verifier signatures and blind signatures were introduced.An id-based designated proxy signature is presented which is able to reduce the complexity of keeping the public key, and designated signature and proxy signature are combined which can be used to prevent signer from forging and desginated verifier from leaking private key on purpose that give others the privilage of verifiering the signature.The proxy-protected blind signature scheme of Amit is improved, the new one conquers the security disadvantage in the old one. And a proxy-protected blind signature scheme based on Elliptic Curve is preseted.更多还原