GestureID:Gesture-Based User Authentication on Smart Devices Using Acoustic SensingOA

User authentication on smart devices is crucial to protecting user privacy and device security.Due to the development of emerging attacks,existing physiological feature-based authentication methods,such as fingerprint,iris,and face recognition are vulnerable to forgery and attacks.In this paper,GestureID,a system that utilizes acoustic sensing technology to distinguish hand features among users,is proposed.It involves using a speaker to send acoustic signals and a microphone to receive the echoes affected by the reflection of the hand movements of the users.To ensure system accuracy and effectively distinguish users’gestures,a second-order differential-based phase extraction method is proposed.This method calculates the gradient of received signals to separate the effects of the user’s hand movements on the transmitted signal from the background noise.Then,the secondorder differential phase and phase-dependent acceleration information are used as inputs to a Convolutional Neural Networks-Bidirectional Long Short-Term Memory(CNN-BiLSTM)model to model hand motion features.To decrease the time it takes to collect data for new user registration,a transfer learning method is used.This involves creating a user authentication model by utilizing a pre-trained gesture recognition model.As a result,accurate user authentication can be achieved without requiring extensive amounts of training data.Experiments demonstrate that GestureID can achieve 97.8%gesture recognition accuracy and 96.3%user authentication accuracy.