Through the cryptanalysis of a threshold proxy signature scheme in literature, the scheme could not resist insider attacks and public-key substitute attacks.
对一种基于双线性对的新型门限代理签名方案进行了密码分析，发现该门限代理签名方案不能抵抗伪造攻击和公钥替换攻击。
Through the cryptanalysis of a new threshold proxy signature scheme based on bilinear pairings, it is found that the scheme cant resist forgery attack and public-key substitute attack.
给出了对一个已有的高效无证书签名方案的替换公钥攻击，表明了在该方案中，攻击者可以通过替换签名者公钥伪造签名；进而针对该攻击提出了改进方案。
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