Proton Authenticator is a free and open-source two-factor authentication (2FA) app that generates time-based one-time passwords (TOTP) to help secure online accounts. It is available on Windows, macOS, Linux, iOS, and Android, allowing users to access their verification codes across devices. The app is designed to work without ads or tracking. A Proton account is optional and mainly used for encrypted sync between devices. How Proton Authenticator works Setup starts with installing the app from … More → The post Product showcase: Proton Authenticator is an end-to-end encrypted, open source 2FA app appeared first on Help Net Security.