What is two-factor authentication?

• A. A method of securing databases with two passwords
• B. An additional layer of security requiring a password and a second form of verification
• C. A technique to back up user data twice
• D. A system that replaces passwords with generated codes

Answer: (B)

Two-factor authentication is a security process that enhances account protection by requiring two distinct forms of verification from the user. This typically involves something the user knows, like a password, and something the user possesses, such as a mobile device generating a code or receiving a text message. This dual requirement makes unauthorized access significantly more difficult, even if one form of authentication, like the password, is compromised.

This method is widely adopted because it adds an extra layer of security, ensuring that even if someone gains access to the password, they would still need the second form of verification to access the account or system. The combination of multiple factors in authentication is fundamental to improving overall digital security.

The other options do not accurately describe two-factor authentication. For instance, securing databases with two passwords does not encompass the full scope of verification processes used in two-factor authentication. Similarly, backing up user data or replacing passwords with generated codes does not align with the principle of requiring two distinct forms of verification for access.