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ssh-keygen

Generate ssh keys used for authentication, password-less logins, and other things.

  • Generate a key interactively:

ssh-keygen

  • Specify file in which to save the key:

ssh-keygen -f ~/.ssh/{{filename}}

  • Generate an ed25519 key with 100 key derivation function rounds:

ssh-keygen -t ed25519 -a 100

  • Generate an RSA 4096 bit key with email as a comment:

ssh-keygen -t rsa -b 4096 -C "{{email}}"

  • Retrieve the key fingerprint from a host (useful for confirming the authenticity of the host when first connecting to it via SSH):

ssh-keygen -l -F {{remote_host}}

  • Remove the keys of a host from the known_hosts file (useful when a known host has a new key):

ssh-keygen -R {{remote_host}}

  • Retrieve the fingerprint of a key in MD5 Hex:

ssh-keygen -l -E md5 -f ~/.ssh/{{filename}}

  • Change the password of a key:

ssh-keygen -p -f ~/.ssh/{{filename}}