A Linux administrator is hardening a server that processes sensitive financial data. According to a new security policy, users must authenticate using their standard password and a second, independent credential, such as a one-time code from a hardware token. Which of the following security controls BEST represents this layered authentication approach?
Multifactor authentication (MFA) is a security control that requires users to provide two or more verification factors to gain access. In this scenario, the password is the 'knowledge' factor, and the hardware token is the 'possession' factor. Pluggable Authentication Modules (PAM) are a framework for integrating authentication modules into applications, not the authentication method itself. The System Security Services Daemon (SSSD) is a service that connects to remote identity and authentication providers. A token represents only a single authentication factor.
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What is Multifactor Authentication (MFA)?
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How does PAM differ from MFA in authentication?
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What role does SSSD play in system authentication, and why is it not MFA?