Using Setup Keys Once you've enabled 2FA on the account or service in question, you'll be asked to either enter a setup key on your device or scan a QR code using your device's camera.

Instead of sending 2FA codes by text message, most major online services let you use an authenticator app to generate codes on your phone. The authenticator app syncs up to your online service ...

Security The Web messaging authentication Whistleblower warning: 2FA codes sent via SMS are trivially easy to intercept Apps or physical authenticators are a better choice By Shawn Knight June 18 ...

The vulnerability Silent Sector identified is related to the secret key embedded in QR codes used for 2FA enrollment. When users scan a QR code to link their authentication apps, such as Google ...