基于身份无可信中心的盲签名和代理签名

分析了现有的基于身份的盲签名和代理签名，发现这些系统都需要无条件信任私钥产生中心（PKG）。因为PKG可以计算系统内任何用户的私钥，当然可以伪造任何用户的盲签名和代理签名。在已有基于身份无可信中心签名的基础上结合基于身份的盲签名提出了一个基于身份无可信中心的盲签名，同时提出了一个基于身份无可信中心的代理签名。分析表明，所提出的盲签名和代理签名是安全有效的。

ID-based blind signature and proxy signature without a trusted party

The current ID-based blind signatures and proxy signatures were analyzed in this paper. It was found that these systems need to trust a Private Key Generator (PKG) unconditionally. Because PKG can compute the private key of any user in system, it can forge a blind signature or a proxy signature of any one. Based on the current ID-based signature and ID-based blind signature, a new ID-based blind signature without trusted PKG was proposed. Meanwhile, a new ID-based proxy signature without trusted PKG was also proposed. The analysis shows that our proposed blind signature and proxy signature are secure and effective.