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Security Fundamentals & Crypto · Foundational

Authenticator App

Mobile application that generates TOTP codes or approves push sign-ins as a possession factor.

Definition

Authenticator apps such as Microsoft Authenticator, Google Authenticator, and Okta Verify store OTP secrets or device-bound keys. Many support push notifications with number matching and passkeys. They are stronger than SMS because they are not exposed to SIM swapping.

Example

Okta Verify prompts the user to approve a sign-in and confirm the number shown on screen.

Exam tip

Authenticator apps are preferred over SMS; push approvals need number matching to resist fatigue attacks.

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