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tldr/pages/common/ssh-keygen.md
Rob Young 44527a82a8 Adds command to show SSH key fingerprint (#935) 
Adds an ssh-keygen command to show the fingerprint of an SSH key in the
same format that is used by Github to list SSH keys that it knows about.
2016-07-26 16:16:42 +02:00

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ssh-keygen

Generate ssh keys user 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 a DSA 2048 bit (default) key:

ssh-keygen -t dsa

  • Generate an RSA 4096 bit key with your 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}}

  • 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}}