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Security Token

Authentication

Multi-Factor Authentication (MFA) Single Sign‑On (SSO) Two-Factor Authentication (2FA) TOTP (Time‑Based One‑Time Password)

A device or code that proves it’s really you.

Definition

A security token is something you use to prove your identity, like a one‑time code, an authenticator app, or a hardware key.

In plain English A device or code that proves it’s really you.

Why this matters

Why it matters: Tokens make it harder for attackers to log in with just a stolen password.

Example

Example: You use a hardware security key to sign in to your email.