奇怪的证书消息

Question

在相同（=相同）的youtube网址上，我得到三个不同的消息（参见附图）。视频可用于IE和Chrome。最令我困惑的是，我有一个服务器证书的私钥（IE版本）。我可能听不懂。

Answer 1

Internet Explorer: Microsoft Family Safety is known to intercept SSL connecitons. That's why you see the certificate for google signed by Microsoft Family Safety and because the private key for the certificate is needed for SSL interception you see that the private key is available on the computer.

Firefox: Firefox uses the system proxy settings and thus is also subject to SSL interception. But Firefox does not use the systems CA store and thus the CA for Microsoft Family Safety is not trusted by Firefox. That's why you get the error.

Chrome: Chrome uses the systems CA store and should also use the systems proxy setting by default. But the picture shows that Chrome gets the original certificate. The only explanation I have for this is that this snapshot was either done on a different computer with different setup or that the settings of Chrome were changed so that it does not use the system settings any more.