It's an enormously effective way to secure logins. 2FA is where you use two authenticators from the list instead of just one, since an attacker is unlikely to have two of the three. Something you have could be a hardware authenticator, such as a YubiKey. Something you are is like biometric data, such as using your fingerprint to unlock a phone. Something you know is like a password, which humans are terrible at and we should really let password managers take care of. 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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