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two-factor-authentication's Introduction

2FA Example App

This is an example of a production ready 2FA example app, inspired by the devise-two-factor gem.

  • Allows to log in with OTP or via backup codes
  • Stores the backup codes and the OTP secrets encrypted in the DB via the lockbox gem
  • Prevents brute force attempts of OTP codes and backup codes
  • Ensures correct OTP setup, by requiring users to enter an OTP code
  • Option to enforce 2FA enrollment, with a grace period
  • Minimal gem dependencies
  • Allows to view/download/print/copy the backup codes
  • User friendly validations
  • Gives friendly error messages when attempting to reuse OTP codes or backup codes
  • Allows for delays (drift) when entering the OTP code
  • Stores when 2FA has been enabled, and when the backup codes have been generated
  • Shows how many backup codes remain available
  • Shows how many 2FA attempts remain for OTP/backup codes
  • Generates QR code or allows manually entering the OTP secret
  • I18n ready

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