Technology
How does two-factor authentication work?
Two-factor authentication (2FA) adds a second check beyond your password. After entering your password (something you know), you confirm a second factor — like a code from your phone (something you have) — so a stolen password alone isn't enough to get in.
See it in motion.
Watch a 2-minute animated lesson that shows exactly how two-factor authentication works.
Step by step
- 1It requires two separate proofs of identity.
- 2Typically a password plus a phone code or app prompt.
- 3A stolen password alone won't grant access.
- 4It dramatically improves account security.
Frequently asked questions
- How does two-factor authentication work?
- You confirm your identity with two things — your password plus a second factor like a phone code.
- Why is 2FA more secure?
- Even if someone steals your password, they still need your second factor, which they're unlikely to have.
- What are common second factors?
- A code texted or generated by an app, a hardware key, or a fingerprint or face scan.