However, their scheme is insecure by presenting a forgery attack, any receiver can impersonate the proxy signer to sign any message without holding the responsibility.

该文给出的一种攻击方案表明他们的方案是不安全的，任何代理签名的接收者都可以假冒代理人对任意的消息生成有效的签名。

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Additionally, the proposed scheme can efficiently withstand message replaying attack, forgery attack, Masquerade attack, guessing and stolen verifier attack and collusion attack.

同时该方案能有效地抵抗重放攻击，伪造攻击，猜测和窃取攻击，扮演攻击及用户合谋攻击等。

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