two-factor authentication via your phone
Google says the keys will be relatively cheap — around $US6 each — and available from multiple manufacturers. It has been testing the service with multiple customers, including Australia’s Woolworths (which was also an early tester for the Chromebox).
It will be a while before consumers can use this — Google says the ability to require authentication via the key will be added to Google Drive For Work in the coming weeks, but hasn’t announced broader availability plans. Nonetheless, it’s a welcome alternative approach.
The Key for working smarter, faster and more securely [Official Google For Work Blog]
Looks like a YubiKey, no?
https://www.yubico.com/
Why can’t they use TPM chips already in many laptops?
Yes, these are from Yubico, you can see more info on them here http://yubi.co/gdfw