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  • Oh, interesting. I thought since man ssh_config listed (e.g.) rsa-sha2-512 separately from ssh-rsa that I'd need to upgrade the keys. Am I wrong? Commented Feb 19, 2020 at 18:23
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    Yes. Even though they're different algorithms, they use the same keys. Commented Feb 19, 2020 at 18:54
  • To check which signature algorithm is used for a key starting with ssh-rsa ..., put it into a file and run ssh-keygen -l -f on it. It will outut e.g. 2048 SHA256:...
    – nh2
    Commented May 24 at 12:48