Chapter 02 — Technology & Internet

What is two-factor authentication?

A second proof of identity beyond your password — usually a code from an authenticator app or a hardware key. It blocks the vast majority of account takeovers even if your password leaks.

Follow-up questions

SMS or authenticator app?

App (Authy, 1Password, Google Authenticator). SMS can be intercepted via SIM-swap attacks.

What is a passkey?

A password replacement stored on your device, unlocked by biometrics. Phishing-proof and syncs across your Apple/Google/Microsoft account.

What if I lose my phone?

Save backup codes when you enable 2FA, or use an app that syncs to the cloud. Otherwise recovery can take days.

Do I need a YubiKey?

Only if you're high-value (crypto holder, journalist, admin). For most people, an authenticator app is enough.

Is SMS 2FA safe enough?

Better than nothing, but vulnerable to SIM-swap attacks. An authenticator app or hardware key is stronger.

People also search

passkeys explained
authy vs google authenticator
sim swap attack
best 2fa app
authenticator app
yubikey vs authy

Related across The Asked