Comment by wasmitnetzen
11 hours ago
I've blown fairly competent colleagues' minds multiple times by showing them the existence of certificate transparency logs. They were very much under the impression that hostnames can be kept secret as a protection against external infrastructure mapping.
Can't it? If you get a wildcard certificate?
Otherwise if you are getting a domain specific certificate, you are obviously giving your cert provider the domains, and why would you assume it would be secret?