Photoplethysmogram (PPG) technology measures volumetric blood-flow changes in the peripheral circulation. Apple has explored using PPG in its AirPods.

The key to continuous authentication lies in its use of machine learning ... Integrating machine learning algorithms with behavioral biometrics is a key factor driving the effectiveness of ...

Just like any lock can be picked, any biometric scanner ... the research out to an actual use case. But he says the strength of the work is in the machine learning techniques it developed.