What is multi-factor authentication and how does it enhance security?

What is multi-factor authentication and how does it enhance security?

• A. Requiring two or more verification methods; reduces risk of credential theft.
• B. Requiring just a password.
• C. Self-certification on security.
• D. Public posting of credentials.

Answer: (A)

Multi-factor authentication means proving who you are using at least two different kinds of evidence. These factors come from different categories, such as something you know (a password), something you have (a code from a text, authenticator app, or a hardware security key), or something you are (a fingerprint or facial recognition). Because the factors are independent, compromising one (like stealing a password) isn’t enough for access—you still need the second form. This significantly reduces the risk of credential theft and unauthorized access. For example, logging in with a password plus a one-time code from an authenticator app, or a password plus a hardware key, is much harder to defeat than just a password alone. The other options describe single-factor approaches or insecure practices, which don’t provide the layered protection MFA offers.

Multi-factor authentication means proving who you are using at least two different kinds of evidence. These factors come from different categories, such as something you know (a password), something you have (a code from a text, authenticator app, or a hardware security key), or something you are (a fingerprint or facial recognition). Because the factors are independent, compromising one (like stealing a password) isn’t enough for access—you still need the second form. This significantly reduces the risk of credential theft and unauthorized access. For example, logging in with a password plus a one-time code from an authenticator app, or a password plus a hardware key, is much harder to defeat than just a password alone. The other options describe single-factor approaches or insecure practices, which don’t provide the layered protection MFA offers.