We try to provide best transparency: We host our code on github, so that you can monitor the development. PrivacyIDEA tries to be open in many ways. Go for privacyIDEA to setup 2-Factor-Authentication for your most precious services and keep the control. It runs on Linux and is completely Open Source, licensed under the AGPLv3. But other “devices” like challenge response, U2F, Yubikeys, SSH keys and x509 certificates are also available. Originally it was used for OTP (One Time Password) authentication devices – being an OTP server. PrivacyIDEA is a modular authentication server that can be used to enhance the security of your existing applications like local login, VPN, remote access, SSH connections, access to web sites or web portals with two factor authentication.