TL;DR
Authy is generally considered a very secure two-factor authentication (2FA) app, but like all security tools, it’s not without risks. This guide helps you understand those risks and how to keep your accounts safe when using Authy.
1. What is Authy?
Authy is a mobile app that generates time-based one-time passwords (TOTP) for two-factor authentication. It’s popular because it offers:
- Multi-device sync: Your accounts are backed up and accessible on multiple devices.
- Offline access: Generate codes even without an internet connection.
- Support for many services: Works with most websites and apps that offer 2FA.
2. Authy Security Concerns
While Authy is strong, here are potential weaknesses:
- Account Recovery: If you lose access to your phone *and* your backup codes, recovery can be difficult.
- SIM Swapping: A malicious actor could potentially port your mobile number to a new SIM card and gain access to your Authy account (though this is becoming harder with modern security measures).
- Cloud Backup: Authy’s cloud backup feature, while convenient, introduces a potential single point of failure.
3. How to Secure Your Authy Account
- Enable PIN Lock: Always set a strong PIN lock on the Authy app itself. This prevents unauthorized access if your phone is unlocked.
- Backup Your Accounts: Crucially, download and securely store your backup key. This allows you to restore your accounts if you lose your device. You can find this in Settings > Backups.
Important: Store the backup key offline – don't email it or save it on a cloud drive without strong encryption! - Consider Disabling Cloud Backup (Advanced): If you’re very concerned about security, disable Authy’s cloud backup feature. This means your accounts are only stored locally on your devices and in your downloaded backup key.
Settings > Security > Disable 'Backups' - Enable Device Lock: Use your phone’s built-in security features (fingerprint, face ID) to lock your device.
- Regularly Review Devices: Check the list of devices logged into Authy and remove any you don’t recognize.
Settings > Devices - Be Aware of SIM Swapping: Contact your mobile provider to add extra security measures to your account, such as a PIN or password required for SIM changes.
- Use Strong Passwords Everywhere Else: Authy protects the *second* factor of authentication. You still need strong, unique passwords for all your online accounts.
4. Alternatives to Authy
If you’re uncomfortable with any of Authy’s risks, consider these alternatives:
- Google Authenticator: A simpler app without cloud backup (but harder recovery if lost).
- Microsoft Authenticator: Similar to Google Authenticator.
- Hardware Security Keys (YubiKey, Titan Key): The most secure option, but requires a physical key for each account.
5. What If Your Authy Account is Compromised?
- Immediately revoke access: Change the passwords on all accounts protected by Authy.
- Contact Support: Contact Authy support for assistance.
- Report to Services: Notify any services where your account was compromised.