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There are several key types. Ed25519 is one of the new ones, and considered quite sound. Check the manual page for ssh-keygen for what's available on your particular systems. DSA should be avoided now, even if it might still be available. If you don't have ed25519 or you have a dongle that requires RSA, then RSA is a good fallback.
Can you show the command you used to create the key? And the command you used to upload it to the server? And, finally, the command you used to try to use the key when connecting with ssh or scp?
This whole process works in PowerShell(YUCK!) but I LOVE linux and want to do it in linux. I noticed in the Powershell script it actually passes the host key. I'd rather do this in linux but this is a very big struggle for me, I've been on this at work and even at home for HOURS!!!!!
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