公开(公告)号：US20210303668A1

公开(公告)日：2021-09-30

申请号：US17212659

申请日：2021-03-25

Applicant: Tata Consultancy Services Limited

Inventor： Tanushree BANNERJEE ,  Venkata Subramanian VIRARAGHAVAN ,  Kartik MURALIDHARAN ,  Dibyanshu JAISWAL ,  Mithun Basaralu SHESHACHALA ,  Ramesh Kumar RAMAKRISHAN ,  Arpan PAL ,  Balamuralidhar PURUSHOTHAMAN

IPC: G06F21/32 ,  A61B5/117 ,  A61B5/024 ,  A61B5/00 ,  G06F21/34

Abstract: Embodiments herein provide a method and system for continuously validating a user during an established authenticated session using Photoplethysmogram (PPG) and accelerometer data. State of the art approaches are mostly based on feature extraction and ML modelling for PPG based continuous session validation, while a template based approach in the art follows a complicated approach. The method disclosed herein utilizes less computation intensive template based approach to continuously validate the user across the session. The method comprises preprocessing a PPG data or PPG signal acquired from a wearable device worn by the user to identify segments of negligible motion. A first segment, after authentication using conventional authentication mechanism, serves as the initial reference. The chosen segments are then tested one by one with respect to the reference. If the templates in a segment match those of the reference, it is updated as the new reference, else a re-authentication is triggered.