Instead, it refers to a theory of authentication where you prove that you should have access with: Something you know, something you are, or something you have.
In practice, two-factor authentication (2FA) is using two things to log in to a site or service, but that's not where the name comes from. This hydra of a hardware key works exactly as it should and comes packed with features the competition can't match, but is hampered by limited support on iOS and a comparatively high price. This tiny double-ended device sports a USB-C connector on one end and an Apple-compliant Lightning connector on the other. The final frontier for Yubico has been the iPhone, which it finally addresses with the YubiKey 5Ci. Yubico's YubiKey line has been a go-to choice for simple, hardware two-factor authentication for years.
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