Simple Passphrase Login component allows you to setup users (without a username) with a simple passphrase to access com_content and its sections, categories and article items! These users are setup separate from the core Joomla com_user component. The backend allows for you to create the users and related passphrase, as well as controlling the user signup emails and other system notifications. The plugin is required to work.

Please visit the demo site: http://webco.info/demo/