How to generate a certificate file which to be used with ssh config?

I have a configuration as below in my ~/.ssh/config file:Host endava HostName Port 2222 User gigi ServerAliveInterval 30 IdentityFile ~/blablabla # CertificateFile ~/blablabla-cert.pubwhich works fine but I'm curious about how would one generate the CertificateFile if really wants to use it? Consider one already has the private and public RSA keys generated with e.g. openssl req -newkey rsa:2048 -x509 [...]....Read more