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Generate an Ed25519 SSH key pair

harmlessSSHalle
Adjust the values, the command updates live
user@server
ssh-keygen -t ed25519 -a 100 -C "admin@example.com" -f ~/.ssh/id_ed25519_server

Creates a private key and the matching .pub file in ~/.ssh. Ed25519 keys are short, fast and considered a secure default. The option -a 100 increases the number of key derivation rounds for the passphrase, making brute-force attacks on a stolen key harder.

Note: If the file already exists, ssh-keygen asks before overwriting it. Use an empty passphrase only for automated jobs.

Also searched as

  • how to generate ssh key
  • create ed25519 ssh key
  • ssh-keygen new key pair

Related one-liners

All in SSH

Change or set the passphrase of an SSH key

$ssh-keygen -p -f ~/.ssh/id_ed25519_server
cautionSSH

Derive the public key from a private SSH key

$ssh-keygen -y -f ~/.ssh/id_ed25519_server
harmlessSSH

Copy your public SSH key to a server

$ssh-copy-id -i ~/.ssh/id_ed25519_server.pub -p 22 webuser@server.example.com
cautionSSH

Remove an outdated host from known_hosts

$ssh-keygen -R server.example.com
cautionSSH

Show the fingerprint of an SSH key

$ssh-keygen -lf /etc/ssh/ssh_host_ed25519_key.pub
harmlessSSH

Start ssh-agent and load a key for a limited time

$eval "$(ssh-agent -s)" && ssh-add -t 4h ~/.ssh/id_ed25519_server
harmlessSSH

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