Which of the following provides two-factor authentication?
A. Username + password
B. Smart card + PIN
C. Fingerprint + retina scan
D. Key fob + ID card
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Excuse me if I’m being dumb here, but would it not be BCD? as they all require 2 steps of authentication?
Two-factor authentication requires two different types of authentication.
Type 1 – Something You Know – includes passwords, PINs, combinations, code words, or secret handshakes. Anything that you can remember and then type, say, do, perform, or otherwise recall when needed falls into this category.
Type 2 – Something You Have – includes all items that are physical objects, such as keys, smart phones, smart cards, USB drives, and token devices. (A token device produces a time-based PIN or can compute a response from a challenge number issued by the server.).
Type 3 – Something You Are – includes any part of the human body that can be offered for verification, such as fingerprints, palm scanning, facial recognition, retina scans, iris scans, and voice verification.
https://www.globalknowledge.com/ca-en/resources/resource-library/articles/the-three-types-of-multi-factor-authentication-mfa/