对张劼等人提出的一类可验证的门限签名方案进行了安全性分析，发现它存在安全漏洞，容易受到合谋攻击和伪造攻击，并且不具备不可否认性。
Through the cryptanalysis of a verifiable threshold signature scheme presented by Zhang and Wen, concluded it not only exist collusion attack and forgery attack, but have no undeniability.
在随机预言模型下，可证明该方案在适应性选择消息攻击下是存在不可伪造的。
It is proven to be existential unforgeable against chosen message attack under the random oracle model.
通过安全分析，该方案满足存在不可伪造性、签名者匿名性、可关联性、可验证性等特点。
Through the security analysis, the scheme satisfies the following properties:Existential unforgeable, signer ambiguous, linkable and verifiable.
方案保证了签名效率和签名的强壮性，在随即预言模型下，证明了其在适应性选择消息攻击和身份攻击下都能抵抗存在伪造。
The proposed signature scheme ensures the efficiency and robustness of signature, and can defend existential forgery on adaptively chosen message and ID…
方案保证了签名效率和签名的强壮性，在随即预言模型下，证明了其在适应性选择消息攻击和身份攻击下都能抵抗存在伪造。
The proposed signature scheme ensures the efficiency and robustness of signature, and can defend existential forgery on adaptively chosen message and ID…
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