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Re:Let's Encrypt Overview by bkeroack on Friday June 12, 2015 @03:43PM (#9708111)
As icebraining wrote, it's technically possible with X.509, but nobody within the public CA industry will do it for business reasons.

You could approach the problem by creating your own root CA for the domain and then issue subordinate CA certs, but obviously for clients to validate them they would need to import your root into their trusted store (in a corporate IT scenario you would push out the root as part of the domain policy).

Re:Let's Encrypt Overview by baby on Friday June 12, 2015 @06:08PM (#9708872)
do modern browser accepts wildcard certificates though?
Re:Let's Encrypt Overview by bkeroack on Friday June 12, 2015 @07:19PM (#9709150)
If you mean a certificate for something like *.domain.com, then yes, every modern browser that I'm aware of will validate it properly.