For more security your authorized_keys file can also be set up to only accept connections from certain IP addresses or hostnames. Setting that up is beyond the scope of this guide, but more ...

The basic was SSH runs is with keys, you create SSH keys in Mac OS X using the ssh-keygen command in Terminal. This feature looks at how to generate an SSH key pair in Terminal.

One of the most universally used Linux/Unix tools is now included by default in Windows 10: OpenSSH. Here's how to get started with it.