This research was mentioned on the Security Now podcast, I thought I should share it.
Link to the podcast if interested
https://www.grc.com/sn/sn-608.htm
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Great article. I like the idea that a master print could be formed that would work on some percentage of devices with some regularity. Shows that we are still not where we need to be with concepts of securing devices.
2-factor authentication would be a better method for accessing your device for sure. Then at least they’d need both the ‘master print’ and a good guess at your password.