1. Background OpenOTP Token is a mobile authentication solution available on iPhone and Android systems which provides secure access for websites, VPNs, Citrix, Cloud Apps, Windows, Linux, SAML, OpenID, Wifi and much more. With OpenOTP Authentication Server, it provides the most advanced user authentication system supporting simple registration with QRCode scan, Software Token based on OATH standards and Approve/Deny login with push notifications. 2. How to install OpenOTP Token 2.