Lesson 4
The Anatomy of 2FA
See what a second sign-in step proves, why a code is a key you never hand over, and how a stolen phone number redirects your texts.
Builds on
Predict
A text arrives with a six-digit WhatsApp code you didn’t ask for. A minute later your friend Dev messages you on WhatsApp: “Sorry, I sent my code to your number by mistake, can you send it back?” What would sending it do?
Choose a prediction, then select Next to see the answer.