The certificateless signature scheme can suffer from public key replacement attack so that any one can forge a valid signature on any message.

该方案能受到替换公钥攻击，以至于任何人都能对任何消息成功伪造签名。

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This paper analyzes the security of a certificateless proxy signature scheme and shows that it is insecure against the public key replacement attack in certificateless cryptosystems.

对无证书代理签名方案进行安全性分析，指出该方案对于公钥替换攻击是不安全的，并给出具体的攻击方法。

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