The paper accordingly and seperately points out new approaches to handle with forgery attack, homomorphism attack and small exponent attack. Based on the analysis of reasons for being easily attacked, the author works out a new blind digital signature scheme.
对两种盲签名方案分别提出了一种同态攻击、伪造攻击和小指数攻击新方法,分析了方案容易被攻击的原因所在,并在改进的基础上提出了一个新型的盲数字签名方案。
参考来源 - 基于群盲签名的多银行电子现金系统研究·2,447,543篇论文数据，部分数据来源于NoteExpress
最后给出了对该类方案的已知明文的同态攻击方法，弥补了该类方案理论分析上的不足。
Homeostasis attack of this kind of scheme is also proposed with known plaintext, all of these could make up the shortcoming of theory analysis.
本文最后还证明了他们提出的两类改进型方案也不能抵御同态攻击，因而并不具有所说的安全性。
Finally this paper shows that two kinds of the improved schemes proposed by Qi can not resist the homomorphism attack, and does not have the security as Qi said.
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