strong, two-factor authentication with mobile phones Standard phone and BlackBerry (J2ME) iPhone Google Android Windows Phone 7 PalmOS webOS Maemo Openmoko Universal Web App Windows Linux MacOS last update of this site: June 4th, 2025 News (2025-06-04): Its-Just-Nans published a web based Mobile-OTP implementation (see Links) (2024-12-16): Ivan published a CLI Mobile-OTP implementation (see Links)