From PC Mag: Security keys can stop sophisticated phishing attacks from compromising your accounts, but most will set you back between $20-$50 per key. It's a big reason why the technology hasn't been widely adopted, but Google wants to change that by letting your Android phone act as a security key.
On Wednesday, Google began making the option available to those with a smartphone running Android 7.0 and up. The built-in security key functions like a hardware-based one, except it's free.
With this system, when you enter your password on the PC, a notification will be sent to the handset. You'll be asked to confirm that you want to sign in. From there, the Android handset will sign an authentication request via Bluetooth to the PC, unlocking your account. For those who already use two-factor authentication when signing into their Google accounts on the PC, the process will be familiar. The difference is under the hood.
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