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Security Fundamentals & Crypto · Intermediate

Number Matching

Push MFA enhancement requiring the user to enter a number shown on the sign-in screen into the authenticator app.

Definition

Number matching ensures the person approving the push is actually looking at the login screen, defeating blind approvals from MFA fatigue attacks. Microsoft enforced number matching for all Microsoft Authenticator push notifications in 2023. Okta Verify and other apps offer similar features.

Example

The login page displays '47', and the user must type 47 into Microsoft Authenticator to approve.

Exam tip

Number matching defeats MFA fatigue but not real-time phishing proxies.

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