Replace the public key in ~/.ssh/authorized_keys on your existing instance so the attacker can no longer unlock it with their private key. Here’s a summary of how to replace the keys mentioned ...

I would like to turn off password authentication for SSH to my server, using keys instead. I don't see an option in Filezilla to use a public key though: is this not a feature of the SFTP spec ...

The Termius client allows you to create SSH connections with ease and even use SSH key authentication, commands and scripts when you connect. Find out how it all works.

Add your SSH key to the session with the command ssh-add. Start using SCP to copy your files. That’s all there is to it. ... SFTP: While SCP defaults to using the SFTP protocol, ...