Proton Authenticator is a free, open-source 2FA app with encrypted sync, offline access, and cross-platform support for secure logins. 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 acces... [2419 chars]
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