I'm wondering, how Github is able to handle so many public keys, which are used for authenticating over ssh.

One user owns aprox 3 certificates and how many users are on Github - millions? Easy multiplication gives us millions of certificates. It isn't in one .ssh/authorized_keys file for user git I guess, right?

They have own ssh server implemented, or exists any mod for OpenSSH solving this kind of problem?

Thanks.

git ssh github openssh
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