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I am trying to configure my sshd on ubuntu 18.04 to accept only ed25519 keys to authenticate, at the moment the server accepts ssh-rsa and ssh-ed25519. Any idea to achieve that? thanks!

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man sshd_config and man ssh_config , is mandatory to read .

PubkeyAcceptedKeyTypes is what you want to use .

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    PubkeyAcceptedKeyTypes ssh-ed25519-cert-v01@openssh.com,ssh-ed25519 worked for me, thanks!
    – vmpr
    Nov 1, 2019 at 4:52

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