Which technology is commonly used in a Two Factor Authentication System?

In a Two Factor Authentication (2FA) system, adding an extra layer of security typically involves two distinct elements: something the user knows (like a password) and something the user has (like a physical device).

The correct answer combines a password with a swipe card, as these elements together provide the dual-factor requirement. The password represents the knowledge factor, while the swipe card represents the possession factor. This means that even if someone intercepts the password, they would still need the physical swipe card to gain access, significantly enhancing security.

In contrast, while other options also include a password, they do not provide the same effective combination of knowledge and possession as a swipe card paired with a password does. For example, a fingerprint is a physical attribute and not a possession; thus it wouldn’t align with an effective knowledge-possession pairing for 2FA. Similarly, a social security number is not a physical item and cannot serve as the second factor in this context. The token code, while it could be effective, is less commonly referenced in the context of general 2FA systems compared to the widely accepted combination of password and swipe card.