After you've checked for existing SSH keys, you can generate a new SSH key to use for authentication, then add it to the ssh-agent.

If you don't already have an SSH key, you must generate a new SSH key. If you're unsure whether you already have an SSH key, check for existing keys.

If you don't want to re-enter your passphrase every time you use your SSH key, you can add your key to the SSH agent, which manages your SSH keys and remembers your passphrase.

Generating a new SSH key

  1. Open TerminalTerminalGit Bash.

  2. Paste the text below, substituting in your GitHub email address.

    ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
    

    This creates a new ssh key, using the provided email as a label.

    Generating public/private rsa key pair.
    
  3. When you're prompted to "Enter a file in which to save the key," press Enter. This accepts the default file location.

    Enter a file in which to save the key (/Users/you/.ssh/id_rsa): [Press enter]
    
  4. At the prompt, type a secure passphrase. For more information, see "Working with SSH key passphrases".

    Enter passphrase (empty for no passphrase): [Type a passphrase]
    Enter same passphrase again: [Type passphrase again]
    

Adding your SSH key to the ssh-agent

Before adding a new SSH key to the ssh-agent to manage your keys, you should have checked for existing SSH keys and generated a new SSH key.

  1. To add the ssh-key to the ssh-agent, the ssh-agent must be running. On OS X Leopard or later, the ssh-agent runs automatically for you. For more information, see "Working with ssh key passphrases." If the ssh-agent isn't already running, start the ssh-agent.

    # start the ssh-agent in the background if it's not already running
    eval "$(ssh-agent -s)"
    Agent pid 59566
    
  2. Add your SSH key to the ssh-agent. If you used an existing SSH key rather than generating a new SSH key, you'll need to replace id_rsa in the command with the name of your existing private key file.

    $ ssh-add ~/.ssh/id_rsa
    
  3. Add the SSH key to your GitHub account.

If you have GitHub for Windows installed, you can use it to clone repositories and not deal with SSH keys. It also comes with the Git Bash tool, which is the preferred way of running git commands on Windows.

  1. Ensure the ssh-agent is running:

    • If you are using the Git Shell that's installed with GitHub Desktop, the ssh-agent should be running.
    • If you are using another terminal prompt, such as Git for Windows, you can use the "Auto-launching the ssh-agent" instructions in "Working with SSH key passphrases", or start it manually:
      # start the ssh-agent in the background
      eval $(ssh-agent -s)
      Agent pid 59566
      
  2. Add your SSH key to the ssh-agent. If you used an existing SSH key rather than generating a new SSH key, you'll need to replace id_rsa in the command with the name of your existing private key file.

    $ ssh-add ~/.ssh/id_rsa
    
  3. Add the SSH key to your GitHub account.

  1. Start the ssh-agent if it's not already running.

    # start the ssh-agent in the background
    eval "$(ssh-agent -s)"
    Agent pid 59566
    
  2. Add your SSH key to the ssh-agent. If you used an existing SSH key rather than generating a new SSH key, you'll need to replace id_rsa in the command with the name of your existing private key file.

    $ ssh-add ~/.ssh/id_rsa
    
  3. Add the SSH key to your GitHub account.