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TOTP

Time-based One-Time Password, a code generated from a shared secret and the current time that changes every 30 seconds. The MFA factor used by Google Authenticator and similar apps.

TOTP generates short codes (typically six digits) from a shared secret and the current time, refreshing on a fixed interval, the codes powering authenticator apps like Google Authenticator, Authy, and many corporate MFA solutions. TOTP is stronger than SMS-based codes but weaker than phishing-resistant factors like FIDO2/passkeys, since attackers can still trick users into typing codes into adversary-in-the-middle phishing pages. It is a foundational MFA factor every IAM analyst should know.

Introduced in: Identity and Access Management

Examples

  • Enrolling a TOTP factor in an authenticator app for an account.
  • Recognizing TOTP as stronger than SMS but weaker than FIDO2.
  • Defending against phishing of TOTP codes via phishing-resistant factors.