[skamoen]

As a university project, I did something very similar, only using a malicious app. The app would monitor the device state, and record gyro data as soon as the screen was on, but the device was locked. We didn't have the time to properly implement a decent classifier, but the data collection was surprisingly effective.

[imjustsaying]

Brilliant. Did you upload the source anywhere?

[idanoeman]

Wouldn't that be a bit irresponsible?

[Neliquat]

Depends on your security philosophy.

[hbk1966]

Very

[lolc]

Why?