wmlele/devise-otp: Two Factors authentication for Devise using Time Based OTP/rfc6238 tokens.

Devise OTP is a Two-Factor Authentication extension for Devise. The second factor is done using an RFC 6238 Time-Based One-Time Password (TOTP) implemented by the rotp library. It has the following features: Optional and mandatory OTP enforcement Setting up trusted browsers for limited access Generating QR codes Some of the compatible token devices are: Google Authenticator FreeOTP.