Why is two-factor authentication considered secure?

Two-factor authentication is considered secure because it combines two different forms of identification, enhancing the security of the access process. This methodology typically requires something the user knows (like a password) and something the user has (like a mobile device to receive a one-time code) or is (like a fingerprint scan). This two-pronged approach significantly reduces the likelihood of unauthorized access; even if one factor is compromised, the attacker still needs the second factor to gain entry.

For instance, if an individual's password is stolen, an attacker would still need the second factor—such as a code sent to the user's mobile device or a physical token—to successfully authenticate. This layered security makes it much harder for unauthorized users to access sensitive information or accounts. The integration of two distinct types of credentials not only serves as a more robust defense against breaches but also strengthens the overall security posture of systems using two-factor authentication.