新型门限代理签名方案的分析与改进

Cryptanalysis and Improvement of New Threshold Proxy Signature Scheme

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 cryptanalysis of threshold proxy signature scheme proposed by Huang et al（denoted as HC scheme） recently, it is found that the scheme could not resist frame attacks and public-key substitute attacks. A new nonrepudiahle threshold proxy signature scheme is proposed, which can resolve the security problem existing in HC scheme. This scheme can resist the frame attack and the public-key substitute attack and meets the safe requirements of threshold proxy signature scheme. Compared with existing schemes, the proposed scheme has obvious advantages in key generation, proxy signature generation and proxy signature generation.