A security architect is implementing a new authentication system that will require users to provide something they know followed by a one-time code sent to their registered mobile device. Which authentication model is being implemented?
Risk-based Authentication
Single Sign-On (SSO)
Federated Authentication
Multi-factor Authentication (MFA)
The correct answer is Multi-factor Authentication (MFA). This authentication model combines two or more authentication factors from different categories: something you know (such as a password), something you have (such as a mobile device receiving a one-time code), and something you are (biometrics). In this scenario, the users need to provide something they know (likely a password or PIN) and then use something they have (their mobile device) to receive and enter a one-time code, making it a multi-factor authentication implementation. Two-factor authentication (2FA) is actually a subset of MFA specifically using two factors, which is what's described in the question, but MFA is the more comprehensive term that encompasses this implementation.
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