The C Bio measures just 1.77 by 0.71 by 0.15 inches (45 by 18 by 3.75 millimeters, HWD). MFA-sometimes called two-factor authentication or 2FA-refers to confirming your identity using at least two of a possible three factors: Something you know, like a password something you have, like a security key and something you are, like a fingerprint scan or some other form of biometrics.įrom the back, the C Bio looks nearly identical to the $55 Editors' Choice winner YubiKey 5C NFC: a slim, black rectangle with a USB-C connector at one end and a metal-reinforced keyring at the top.

It's missing the advanced authentication features found in other YubiKeys and won't work with an iPhone without a dongle, but it's the best biometric MFA experience we've yet seen-earning it a Technical Excellence award. While expensive, this small device uses biometric MFA to make it much harder for bad guys to take over your accounts. After being teased several years ago, the company's long-awaited foray into biometric security has finally arrived in the form of the $85 YubiKey C Bio. Yubico has long been the biggest player in the world of security keys for multi-factor authentication (MFA), helping to shape not only the hardware but also the underlying standards on which all such devices rely.

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