Also, in some environments, you can request a ca to generate a ca certificate for a self-signed certificate, which validates and resigns the previously generated certificate.
而且，在某些环境中，您可以请求CA为自签署的证书生成一张ca证书，这就确认并再签署了以前生成的证书。
If you are your own CA, you control that CA as long as no one else has it.
如果您是自己的CA，那么只要别人无法染指您想控制多长时间都行。
When the ca USES a self-signed certificate, called a Root ca, the ca usually publishes its self-signed certificate details publicly so that users can establish the authenticity of the ca.
当CA使用自签名证书时(称为根ca)，该ca通常公开发布其自签名证书详细信息，因此用户可以确定该CA的真实性。
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