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generate_keys.md

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Generate SSH keys

  1. Generate an SSH key that uses the Ed25519 algorithm.

    ssh-keygen -a 100 -t ed25519 -f ~/.ssh/id_ed25519

    • -a Specifies the number of KDF (key derivation function) rounds used. Higher numbers result in slower passphrase verification and increased resistance to brute-force password cracking.

    • -t Specifies the type of key to create.

    • -f Specifies the filename of the key file.

    Generated keys:

    • Private ~/.ssh/id_ed25519
    • Public ~/.ssh/id_ed25519.pub

    A useful command to check all available SSH keys.

    for key in ~/.ssh/id_*; do ssh-keygen -l -f "${key}"; done | uniq

  2. Upload the public key to the remote host.

    ssh-copy-id -i ~/.ssh/id_ed25519 [email protected]
    • i Use only the key(s) contained in identity_file.

  3. Test the public key has been uploaded to the remote host.

    ssh -i ~/.ssh/id_ed25519 [email protected]

  4. Update the SSH config on the local host.

    vi ~/.ssh/config

    Host remote-host 
  HostName remote-host.dev 
  User username
  IdentityFile ~/.ssh/id_ed25519
  IdentitiesOnly yes

  5. Test SSH configuration.

    ssh remote-host

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