BungeeAuth, a Two-Factor Authentication plugin for Minecraft BungeeCord.
BungeeAuth is a paid plugin on spigot that you can buy for 10 dollars. This plugin is for people that need their BungeeCord Network secure, with Two-Factor Authentication. This plugin works with the Google Authenticator App, so staff can securly login, and if they get hacked, the hackers can't do anything. Examples of the plugin: