[spec] Certificate trust

[Stephane Bortzmeyer]

On Sun, Feb 28, 2021 at 11:16:47PM +0100,
 Solene Rapenne <solene at perso.pw> wrote 
 a message of 15 lines which said:

> With ssh you can use https://en.wikipedia.org/wiki/SSHFP_record
> to improve the security for first connection.

Or you can, if you care about the first connection, ask the sysadmin
about the public key to expect, and check it yourself. As Côme
Chilliet explained, that's the *huge* difference between SSH and
Gemini; with SSH, you typically connect to only a few servers and you
know their admins (and they know you).