ssh-keygen

all

Generate SSH keys used for authentication, password-less logins, and other things. See also: `ssh-copy-id`.

Examples (8)

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 -t ed25519 -a 32 -f ~/.ssh/filename

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

Change the password of a key

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

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

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

Retrieve public key from private key

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