When you set up SSH, you'll generate an SSH key and add it to the ssh-agent and then add the key to your GitHub Enterprise account. Adding the SSH key to the ssh-agent ensures that your SSH key has an extra layer of security through the use of a passphrase. For more information, see "Working with SSH key passphrases."
We recommend that you regularly review your SSH keys list and revoke any that are invalid or have been compromised.