新的不可否认门限代理签名方案

New nonrepudiable threshold proxy signature scheme

对文献的门限代理签名方案进行了密码分析,发现该方案不能抵抗内部攻击和公钥替换攻击.提出了一个新的安全高效的不可否认门限代理签名方案,新方案克服了原方案的缺点,不仅能够抵抗内部攻击、公钥替换攻击和合谋攻击,而且满足安全门限代理签名方案的安全要求,可以在公开信道中进行.

Through the cryptanalysis of a threshold proxy signature scheme in literature, the scheme could not resist insider attacks and public-key substitute attacks. A new nonrepudiable scheme with high safety and efficiency was proposed. The new scheme remedies the weaknesses of the literature＇s, i.e. it can resist the insider attack and the public-key substitute attack and has the properties of threshold proxy signature scheme. It can resist the collusion attack and can be realized in a public channel.