摘要： 为有效保护签名者的合法权益，防止盲签名的非法使用，解决传统公钥密码系统所存在的证书管理和使用代价高昂等问题，应用双线性映射，结合基于证书公钥密码体制和部分盲签名系统，提出一类基于证书的部分盲签名方案，包括基于证书部分盲签名的形式化定义及其安全性定义，并构造一个具体的基于证书的部分盲签名方案。在随机预言机模型下，基于计算Diffie- Hellman困难性假设，证明该方案的安全性，结果表明，该方案简化了基于传统公钥系统部分盲签名中证书的发布、存储与管理，并解决了基于身份部分盲签名系统中的密钥托管问题。

关键词: 数字签名, 基于证书, 部分盲签名, 双线性对, 随机预言机模型, 可证安全

Abstract: In order to effectively protect the legitimate rights of signer, to prevent unauthorized use of the blind signature, and to solve the costly management and use problems of certificate in traditional public key cryptography system, this paper proposes a certificate-based partially blind signature using bilinear maps, which incorporates the certificate-based encryption into partially blind signature system, with formal definition and security definition, and constructs a concrete certificate-based partially blind signature scheme. A rigorous security proof is given under the random oracle model, which security is based on the computational Diffie-Hellman Complexity Assumption. Results shows that the new scheme not only simplifies issue, management and storage of the certificate in based on traditional public key partially blind signature, but also overcomes the private key escrow problem in ID-based partially blind signature.

Key words: digital signature, certificate-based, partially blind signature, bilinear pairings, random oracle model, provably secure

中图分类号: 

• TP309