生成签名后，对XFDL文档的任何修改都将造成签名验证失败。
After the signature is generated, any changes to the XFDL document can make a signature fail to verify.
该签名是消息体的一种表示；如果消息体发生改变，则签名验证就将失败。
The signature is a representation of the message body; if the body has been changed, the signature verification will fail.
该签名是消息体的一种表示；如果消息体发生改变，则签名验证就将失败。
The signature is a representation of the message body; if the body has been changed, the signature verification will fail.
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