The pair of devices also doubles as security-you can leave one at home as a backup. The Titan bundle isn't just one key though, it's a pair of devices: one Bluetooth-enabled dongle for connecting to mobile devices, and one USB stick for more traditional desktops. Google's Titan bundle is a similar implementation to already existing solutions like the Yubikey, where instead of receiving a confirmation code by SMS or using an authenticator app, you prove you are actually you by having a special, physical key on your person. The release comes a few months after a Google spokesperson (calculatedly, it seems) told security blog Krebs on Security that the use of such keys dropped successful phishing attacks among its own employees to zero. The search giant just announced its Titan Security Key Bundle, a pair of two security keys designed to act the second factor in two-factor authentication and make phishing attacks basically impossible.

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