Two-factor authentication serves which primary purpose?

Two-factor authentication serves which primary purpose?

• A. To simplify login by removing factors.
• B. To require two different devices for every login.
• C. To require two separate biometrics.
• D. To increase security by requiring two independent proofs of identity.

Answer: (D)

Two-factor authentication strengthens security by requiring two independent proofs of identity drawn from different kinds of credentials. Instead of relying on a single factor like a password, you must present two separate proofs, such as something you know (a password), something you have (a hardware token or authenticator app code), or something you are (a biometric). The independence of these factors means that even if one is compromised, access still requires the second factor, making unauthorized entry much harder. For example, signing in with a password plus a codes from an authenticator app, or a smart card plus a PIN, demonstrates two distinct proofs. This isn’t about removing factors, or about needing two devices, or about two biometrics—the core idea is using two different kinds of proofs to boost security.

Two-factor authentication strengthens security by requiring two independent proofs of identity drawn from different kinds of credentials. Instead of relying on a single factor like a password, you must present two separate proofs, such as something you know (a password), something you have (a hardware token or authenticator app code), or something you are (a biometric). The independence of these factors means that even if one is compromised, access still requires the second factor, making unauthorized entry much harder. For example, signing in with a password plus a codes from an authenticator app, or a smart card plus a PIN, demonstrates two distinct proofs. This isn’t about removing factors, or about needing two devices, or about two biometrics—the core idea is using two different kinds of proofs to boost security.