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通过对Huang等人提出的门限代理签名方案(HC方案)进行安全性分析,发现方案不能抵抗框架攻击和公钥替换攻击。提出了一个新的不可否认门限代理签名方案,新方案克服了原方案的安全缺陷,不仅能够抵抗框架攻击和公钥替换攻击,而且满足门限代理签名方案的安全要求。相比已有方案,方案在密钥生成、代理签名生成、代理签名验证阶段具有明显的优势。
Through the security analysis of the threshold proxy signature scheme (HC scheme) proposed by Huang et al., It is found that the scheme can not resist the framework attack and the public key replacement attack. A new undeniable threshold proxy signature scheme is proposed. The new scheme overcomes the security flaws of the original scheme and can not only resist the framework attack and public key replacement attack, but also meet the security requirements of the threshold proxy signature scheme. Compared with the existing schemes, the scheme has obvious advantages in key generation, proxy signature generation and proxy signature verification.