lmr/duo_auth (packagist): Duo Security two-factor authentication for Roundcube. Users have multiple ways to authenticate, including: 1. One-tap authentication using Duo’s mobile app; 2. One-time passcodes generated by Duo’s mobile app (works even with no cell coverage); 3. One-time passcodes delivered to any SMS-enabled phone; 4. Phone callback to any phone (mobile or landline!); 5. One-time passcodes generated by an OATH-compliant hardware token.
Keywords: Authentication|two-factor|Duo Security