Google's two-factor authentication application for mobile devices. After logging into a site that uses Authenticator, users receive a phone message with a unique numeric code for that login session.

You'll get a QR code or setup key. Next, open the Google Authenticator app and tap the plus sign. Record the 2FA code/key. Whenever you're asked for the 2FA code, open Google Authenticator to find it.

Microsoft Authenticator is a security app for two-factor authentication. It competes directly with Google Authenticator, Authy, LastPass Authenticator, and others. You may run into the app when ...

In the example above, Google Authenticator may collect data from your Contact List, email address, and photos and videos. This is a lot of data for an app with a simple purpose. When choosing an ...