ssh-keygen

Generate SSH keys used for authentication, password-less logins, and other things. See also: ssh-copy-id. More information: https://man.openbsd.org/ssh-keygen.

Generate a key interactively:

ssh-keygen

Generate an ed25519 key with 32 key derivation function rounds and save the key to a specific file:

ssh-keygen -f {{~/.ssh/filename}} -t ed25519 -a 32

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

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

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

Change the password of a key:

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

Change the type of the key format (for example from OPENSSH format to PEM), the file will be rewritten in-place:

ssh-keygen -f {{~/.ssh/OpenSSH_private_key}} -p -m PEM

Retrieve public key from private key:

ssh-keygen -f {{~/.ssh/OpenSSH_private_key}} -y

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ssh-keygen

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