Abstract: After analyzing a proxy blind signature scheme proposed by Huang et al., it was pointed out that the scheme was insecure against the original signer and signature receiver's forgery attack. To overcome the security problems existing in Huang's scheme, an improved proxy blind signature scheme was proposed. The new scheme resolved forgery attack in the former scheme and met the security requirement of proxy blind signature scheme. The analytical results prove that the new scheme is more secure and practicable, and suitable for electronic cash.

Key words: proxy signature, blind signature, proxy blind signature, discrete logarithm, forgery attack

摘要： 通过对黄辉等人提出的代理盲签名方案的分析，指出该方案不满足不可伪造性，原始签名者和签名接收者都可以伪造代理签名者的盲签名。针对这些安全缺陷，提出了一种改进的代理盲签名方案。新方案克服了原方案中存在的代理盲签名伪造问题，且满足完整性、不可伪造性、可验证性及强盲性等安全特性。结果表明，新方案比原方案具有更高的安全性和实用性，可应用于电子现金等领域。

关键词: 代理签名, 盲签名, 代理盲签名, 离散对数, 伪造攻击