Abstract: The blindness is a very important property of a blind signature scheme.Zhang et al have pointed out that Huang et al’s id-based blind signature doesn’t satisfy blindness.In this paper，an improvement is proposed，which not only mends the security leak but also retains the merits of the original id-based blind signature scheme.Analysis of Zheng et al’s blind signature based on bilinear parings shows that it doesn’t satisfy blindness.The improved scheme overcomes the disadvantage of it and also retains the merits of the original blind signature scheme based on bilinear parings.

Key words: blind signature, blindness, identity-based, bilinear pairings

摘要： 盲性是盲签名的一个非常重要的特性。Zhang等人指出Huang等人的基于身分的盲签名不具有盲性，这里对其进行了改进，改进后的方案克服了原方案的安全隐患，并且保留了原方案的其它优点。分析郑卓等人的基于双线性对盲签名方案后发现其也不具有盲性，改进后的方案在保留原方案优点的同时克服了原方案的安全隐患。

关键词: 盲签名, 盲性, 基于身份, 双线性对