Think about someone who wants to camouflage his identity to be a sender from your bank. He can easily get a certificate using a false name, then send you any signed e-mail pretending he is working for your bank. You will get that e-mail, and the e-mail or the document within has the &quot; valid signed &quot; icon.
示例：假设某人要将身份伪装成与您有往来的银行的发件人。此人可以使用假名轻易获取证书，然后向您发送任何已签名的电子邮件，假装他在与您有往来的银行工作。您会收到该电子邮件，并且电子邮件或邮件中的文档都具有“有效签名”图标。