Systems, methods, and non-transitory computer readable media including instructions for performing operations for continuous authentication based on facial skin micromovements is disclosed. The operations may include receiving during an ongoing electronic transaction, first signals representing coherent light reflections associated with first facial skin micromovements during a first time period and second signals representing coherent light reflections associated with second facial skin micromovements during a second time period. The operations may also include determining, using the first and second signals, that a specific individual is associated with the first and second facial skin micromovements. The operations may also include receiving during the ongoing electronic transaction third signals representing coherent light reflections associated with third facial skin micromovements. The operations may further include determining, using the third signals, that the third facial skin micromovements are not associated with the specific individual, and initiating an action based on the determination.