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Generate SSH key

Ed25519 uses elliptic curve cryptography with good security and performance.

Create new key

Terminal window
ssh-keygen -t ed25519 -C "$(whoami)@$(hostname)" -P "" -f ~/.ssh/id_ed25519

or if you prefer email address

Terminal window
ssh-keygen -t ed25519 -C "" -P "" -f ~/.ssh/id_ed25519

Start the SSH agent in the background:

Terminal window
eval "$(ssh-agent -s)"

Update your ~/.ssh/config:

Host *
AddKeysToAgent yes
UseKeychain yes
IdentityFile ~/.ssh/id_ed25519
IdentityFile ~/.ssh/id_rsa

Add the private key to the SSH agent on macOS:

Terminal window
ssh-add --apple-use-keychain ~/.ssh/id_ed25519

Copy public key to clipboard

Terminal window
cat ~/.ssh/ | pbcopy

Once you have created a new SSH public key, this key can be copied to the .ssh/authorized_keys file on remote hosts to allow remote login or upload your key to GitHub

Terminal window
ssh-copy-id -i ~/.ssh/ root@remote.server.address

Generating a new SSH key and adding it to the ssh-agent