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Research Computing Architect at the University of California, Berkeley

comment Why is SSH key authentication better than password authentication?
@ExUmbris rather than changing the port you should consider using fwknop: Single Packet Authorization and Port Knocking. The benefit here should be obvious: when you don't allow anyone to even see that the port is open anywhere unless they have been given access to the port through knocking with SPA, then they can't even attempt to find it with nmap and exploit it. That is much better than simple security through obscurity.