RCDevs OpenOTP Radius Bridge provides a RADIUS RFC-2865 (Remote Authentication Dial-in User Service) API for the OpenOTP Authentication Server. It is an optional server component to be deployed on top of your OpenOTP infrastructure. Radius Bridge is implemented over the powerful FreeRADIUS software. The RADIUS API interfaces with VPN servers and many other software applications requiring end-user authentication. The supported authentication schemes are based on One-Time Passwords technologies (OATH HOTP/TOTP or mOTP Software Tokens, SMS One-Time Passwords, and Mail / Secure Mail One-Time Passwords).