La Two-factor authentication has become a standard to protect online accounts. While strong passwords are still essential, they alone are not enough to prevent attacks or breaches. With 2FA, the user adds a second element of verification, typically a six-digit code generated on the fly.
Compared to codes sent via SMS (vulnerable to attacks like SIM swapping), authentication apps offer a much more resilient system, as the codes are created locally and expire in a matter of seconds. Proton Authenticator elevates this level of protection thanks to its advanced encryption and independence from any manufacturer or closed ecosystem.
That is why the Swiss company Proton AG, creator of services such as Proton Mail, Proton Drive and Proton VPN, has introduced Proton Authenticator, a free and open-source application that takes two-factor authentication security to the next level.
Based on the TOTP (Time-based One-Time Password) algorithm, this tool generates one-time passwords with a limited validity period, offering greater flexibility and control than proprietary solutions such as Google Authenticator, Microsoft Authenticator, Authy, or Duo.
Proton Authenticator It's not just a 2FA code generatorIts design responds to the need to offer a secure and private experience without relying on third-party services, without ads or trackers. The app allows access to codes even when offline, protect access with biometric or PIN authentication, and sync data between devices with end-to-end encryption.
Furthermore, offers backup, encryption, key import and export and compatibility with other authenticators, making migration easier. This freedom breaks the limitations of many closed apps, which don't allow code extraction or transfer.
Key features and advantages over other authenticators
Proton Authenticator incorporates features that set it apart from its competitors. These include:
- Encrypted backups of secret keys, stored locally or in the cloud.
- Secure key synchronization between multiple devices using end-to-end encryption.
- Access protection through biometric authentication or PIN code.
- Offline operation and the ability to add keys via a QR code.
- No ads or trackers, no need to log into Proton services, and no dependency on a specific manufacturer.
- Import and export keys for easy migration between platforms.
How the TOTP algorithm works
The nucleus Proton Authenticator is the TOTP algorithm, which generates verification codes on the user's local device. The secret key and the current time are combined to produce a code valid for only 30 seconds. This system avoids the need to exchange data with a server for each verification, which reduces the attack surface and strengthens privacy.
The calculation is performed using hash algorithms such as SHA-1, SHA-256, or SHA-512, and the generation of each code is completely independent of the internet connection, ensuring its availability at any time.
It is worth mentioning that PRoton also offers two-factor authentication through Proton Pass, your password manager with built-in 2FA. The main difference lies in the approach: Proton Pass combines passwords and codes in a single app for greater comfort, while Proton Authenticator works as a standalone tool, ideal for those looking to isolate password management and add an extra layer of security.
Both options are free, prioritize privacy and adapt to different user profiles. The choice depends on the balance each person seeks between practicality and account security.
Finally, it is worth mentioning that the source code is available under the GPLv3 license, and versions are offered for Android, iOS, Linux, macOS and WindowsThe app's development combines different languages depending on the platform: Kotlin for Android, Swift for iOS, and Rust for desktop environments.
If you are interested in knowing more about it, you can consult the details In the following link.