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TOTP (Time‑Based One‑Time Password)

Authentication

Multi-Factor Authentication (MFA) Authenticator App Two-Factor Authentication (2FA)

A code that changes every 30 seconds.

Definition

TOTP is a login code generated from a shared secret and the current time. The code changes frequently, so old codes quickly become useless.

In plain English A code that changes every 30 seconds.

Why this matters

Why it matters: It adds a strong extra step beyond passwords, reducing the damage of password leaks.

Example

Example: Google Authenticator shows a 6‑digit code that refreshes regularly.