改进后的方案具有不可否认性，不使用安全信道，以及抵抗公钥替换攻击和合谋攻击等优点。
Improved schemes have advantages of nonrepudiation, using insecure channel, against the public key substitution attack and collusion attack etc.
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.
安全性分析表明该方案能够防止明文攻击、合谋攻击和伪造攻击。
The security analysis shows it can prevent plaintext attack, conspiracy attack and forging attack.
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