Harvesting unpredictable biological noise from photoplethysmography (PPG) and electrocardiogram (ECG) sensors.
WearableHSM pairs silicon TRNGs with biological entropy harvested from optical PPG sensors. Microscopic timing variations between heartbeats (heart-rate variability) provide an unpredictable, living physical entropy stream that enhances master seed generation.
If the wearable is removed from the patient's skin, optical reflectance sensors immediately trigger an on-body disconnect event. WearableHSM locks operational cryptographic keys into a dormant state, requiring biometric re-authentication before releasing sensitive health logs.