debian/local/ssh_config.d/modern-ssh.conf


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# /etc/ssh/ssh_config.d/modern-ssh.conf

CASignatureAlgorithms ssh-ed25519
Ciphers chacha20-poly1305@openssh.com
HostbasedKeyTypes sk-ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,ssh-ed25519-cert-v01@openssh.com,ssh-ed25519