another reference
Welcome!
Try also reading "SSH Mastery" by Michael W. Lucas
(Tilted Windmill Press)
This book will give you some insight into SSH usuage and configuration.
The book will illustrate how-to set up and use server and host
keys to improve that security you were asking about. This is a
prime example of a feature of "OpenBSD" that enhances its
security and usefulness. (with cryptology)
Note: As mentioned by others, you may improve
your security further by utilizing Pf.conf, i.e. OpenBSD packet
filtering in conjunction with SSH. Take a look at their man pages
and their config files. (i.e. etc/ssh_config etc/sshd_config and
/etc/pf.conf
If your appreciate security and correctness then OpenBSD is the place.
Enjoy!
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