What is two-factor authentication?

• A. A process requiring a single password to access accounts
• B. A security measure requiring two forms of verification to access an account
• C. A method for creating strong passwords
• D. A technique to encrypt data on a server

Answer: (B)

Two-factor authentication is a security measure that significantly enhances account protection by requiring two distinct forms of verification before granting access. This typically involves something you know (like a password) and something you have (such as a mobile device that receives a verification code). By necessitating two types of verification, it adds an additional layer of security, making it considerably harder for unauthorized users to gain access, even if they have obtained the password. This approach helps protect sensitive information and personal data from potential breaches, as it requires more than just a password to compromise an account.

The other choices, while related to security, do not capture the essence of two-factor authentication. They either focus solely on password strength or encryption techniques, which do not involve the two-step verification process that characterizes two-factor authentication.