ssh-keygen

Generate ssh keys used for authentication, password-less logins, and other things. More information: <https://man.openbsd.org/ssh-keygen>.

Install

All systems
curl cmd.cat/ssh-keygen.sh
Debian Debian
apt-get install openssh-client
Ubuntu
apt-get install openssh-client
Alpine
apk add openssh
Arch Arch Linux
pacman -S openssh
image/svg+xml Kali Linux
apt-get install openssh-client
CentOS
yum install openssh
Fedora
dnf install openssh
Windows (WSL2)
sudo apt-get update sudo apt-get install openssh-client
OS X
brew install openssh
Raspbian
apt-get install openssh-client
Dockerfile
dockerfile.run/ssh-keygen
Docker
docker run cmd.cat/ssh-keygen ssh-keygen powered by Commando

Generate ssh keys used for authentication, password-less logins, and other things. 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 -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 -N "" -m PEM -f ~/.ssh/OpenSSH_private_key
  • Retrieve public key from secret key:
    ssh-keygen -y -f ~/.ssh/OpenSSH_private_key

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