The 'Secure Shell' protocol provides access to your Ubuntu Appliance and uses cryptographic keys to authenticate you to the device. You need SSH software and keys.

Run the following command:

ssh-keygen -t rsa

1. This starts the key generation process. When you execute this command, the ssh-keygen utility prompts you to indicate where to store the key
2. Press the ENTER key to accept the default location. The ssh-keygen utility prompts you for a passphrase
3. Type in a passphrase

You now have a public and private key that you can use to authenticate.