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I was reading the following question:

Why do mobile devices force user to type password after reboot?

To find out why fingerprint authentication on my Windows 10 laptop isn't an option on startup. It turned out to be because it did not meet the following requirements:

  • On each entry, the device must transform the password through a key-derivation function into the one and only correct encryption key, otherwise the device won't be able to decrypt the data

  • Derived through a one-way function, not "unlocked" by comparing data provided by a user with a pattern stored on the device

Then how come a Windows device can be unlocked on initial startup with facial recognition? That doesn't fulfill the two requirements above.

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