High Security User Authentication Based on Piezoelectric Keystroke Dynamics Applying to Multiple Emotional Responses

With the rapid development of touch sensing technology, keystroke authentication has been proved to be a more secure and reliable identification method. However, emotion has a big influence on users' keystroke habits, a condition not considered in previous studies, yet greatly affect the accuracy of keystroke authentication. In this article, we propose a new strategy for keystroke authentication applicable to multiple emotional states based on piezoelectric touch panel, which provides precise force data and enables a higher detection accuracy. In our experiment, keystroke samples composed by force and time features of legitimate user and intruders in different emotions were collected by a piezoelectric touch screen. Four typical machine learning algorithms were used for authentication. Finally, the result was demonstrated, that Random Forest classifier achieved an accuracy of 96.40%, a FAR of 1.02% and a FRR of 8.82%, which is significantly better than the result when only emotion-stable keystroke samples were used to train classifiers. The proposed strategy improves the practicability of keystroke authentication technique in real world application.