I've done this once, as a client. I believe it was with startssl.com. Somehow I messed it up, I don't know, but in the end it was quite troublesome to get it wo

I've done this once, as a client. I believe it was with startssl.com. Somehow I messed it up, I don't know, but in the end it was quite troublesome to get it working. And then I'm a pro user, so I consider myself someone who should be able to get this working. Another problem is how to manage your keys between devices. If this would be offered as an extra option, just like Gmail has 2FA, that would be great!