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I got a Moto G4 Plus recently. It has a pretty fast fingerprint sensor. For my own reasons I don't want a secondary/backup(pattern/pin/etc) method to unlock my phone. I want to unlock it solely using my fingerprint. I'm ready to root it if needed. I know this comes with risks of being locked out of my phone or other emergencies, I'm ready for it. Does anyone have a way of achieving this?

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That isn't possible.

Android encrypts a lot of your data when the phone turns off so no one can access your files. The key to that encryption, however, is the hard password you don't want to use. A fingerprint cannot be used a an encryption key because it is a system that has an error tolerance, and therefore does not work as an encryption key.

In other words, this is impossible under any circumstance. It's just how Android works.

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  • That seems reasonable, that error tolerance part, but could you please cite credible sources to support your claim?
    – Firelord
    Nov 16, 2016 at 13:38
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    @Firelord I'm looking for a more credible one, but here's what I found quickly. I'll look more after my classes. m.slashdot.org/story/302377
    – Ethan Z
    Nov 16, 2016 at 13:57
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    @EthanZ, that actually makes sense. Thanks. But is there any app (like applock) that would let me lock other apps on my phone using only fingerprint and not a secondary pattern or pin?
    – Spectrum
    Nov 17, 2016 at 8:20
  • Maybe a custom launcher, but that isn't my field of expertise. I'd do some googling
    – Ethan Z
    Nov 18, 2016 at 12:27

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