The U2F Garden
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Titan Key (Gen1)

No longer supported, the first generation of Google’s Titan keys started the trend.

Titan Key (Gen1)

FIDO2 Certification

Has been certified by the FIDO Alliance as conforming to FIDO2 standards

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U2F Authentication

Conforms to the U2F Authenticator/WebAuthn standard

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Google’s first generation Titan Keys were introduced under their Advanced Protection program. The pair of keys, a Bluetooth/USB and USB A + NFC set, were sold for $50.

These keys were found to have a vulnerability in the Bluetooth dongle: According to a Google Security Blog post, the Bluetooth tokens are vulnerable to an attack which requires proximity (about 30 feet) and prior knowledge of some parts of the user’s credentials already, on top of having a very small time window.

The non-Bluetooth keys are safe, however they are not recommended for new installations. The Generation 3 keys are recommended instead. Google has not included Bluetooth U2F tokens in their later generations, saying in an announcement:

Since NFC functionality is now supported by a wide range of Android phones and iPhones, we are discontinuing the Bluetooth Titan Security Key and focusing on the easier and more widely available NFC capability. However, for existing users with our Bluetooth Titan Security Keys, these will continue to work with Bluetooth and will continue to work as an NFC key on most modern mobile devices. Applicable warranties for existing Bluetooth Titan Security Keys will continue to be honored per their terms. All Titan Security Keys are built with a hardware secure element chip that includes firmware engineered by Google to verify the key’s integrity.