Proton Authenticator vs RSA Authenticator (SecurID)

Proton Authenticator generates time-based one-time codes for two-factor authentication, adding a code at login to help secure accounts. It can display codes without an internet connection, and a Proton Account is not required to use it. Signing in is optional and enables code syncing across devices. Users can import codes from Google Authenticator, 2FAS, Aegis Authenticator, Bitwarden Authenticator, Ente Auth, and LastPass Authenticator, then export their codes from the app. Backups can be stored locally or in the cloud, with end-to-end encrypted sync between devices. Proton says its servers cannot access synced data in unencrypted form; when sync is on, entries are protected with 256-bit AES-GCM. The app is open source, and its vault can be unlocked with face or fingerprint recognition. It is available for Android, iOS, Linux, macOS, and Windows; Android is also available through F-Droid. Proton Authenticator is free on all listed platforms, with no ads or tracking.

RSA Authenticator (SecurID) is an authentication system for organizations securing on-premises environments and supporting access to cloud and on-premises applications. It offers hardware and software authenticators, including OTP, MFA, and passwordless options. The mobile app supports push notifications, device biometrics, FIDO, and OTP for applications such as VPNs and Microsoft 365. RSA Authentication Manager provides authentication, access, and management capabilities and can be deployed on a hardened rack-mountable appliance. RSA describes its hybrid approach as intended to maintain access during network disruptions or cloud outages. Integration paths include SAML, RADIUS, and authentication APIs, with named integrations such as Okta and SailPoint. The mobile app can manage up to 30 credentials, but they cannot be backed up or restored; device-bound passkeys also cannot be exported or restored. Version 4.7 requires Android 10.0 or later or iOS 16.0 or later. RSA states that it uses FIPS 140-2 or FIPS 140-3 validated cryptographic modules for data at rest and in motion across mobile apps, cloud, and on-premises.