新的无可信私钥生成中心的盲签名方案

摘要

In order to eliminate the inherent key escrow problem in identity-based public key cryptosystem, a new identity-based blind signature scheme without trusted Private Key Generator (PKG) was proposed. Under the random oracle model, the scheme was proved to be existentially unforgeable against adaptive chosen message and identity attacks from common attackers or semi-honest PKG, and the security was reduced to computational Diffie-Hellman assumption. For the forgery attacks from the malicious PKG, the legitimate signer can prove to the arbitration institution that the signature is forged by trace algorithm.%为了消除基于身份公钥密码体制中密钥托管带来的安全隐患,设计了一个基于身份的无需可信私钥生成中心(PKG)的盲签名方案.在随机预言机模型中证明了新方案对普通攻击者和半诚实的PKG的自适应选择消息和身份攻击是存在不可伪造的,安全性归约为计算Diffie-Hellman问题；而对恶意PKG的伪造攻击,合法签名者可以通过追溯算法向仲裁方证明签名是伪造的.