tldr/pages/common/ssh-keygen.md

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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}}`