Abstract: A user's emotion can be determined based on pupil dilation response to a challenge prompt. In response to an authentication request, a registered challenge prompt and an expected pupil dilation response can be retrieved. The challenge prompt can include one or more images or a video designed to cause a pupil dilation response in a user. The challenge prompt is displayed to the user and the user's pupil dilation response is captured. At least one user action of the user is monitored and an emotion is determined based on the at least one user action. The emotion is associated with the pupil dilation response.

Abstract: Users can be authenticated based on pupil dilation response to a challenge prompt. In response to an authentication request, a registered challenge prompt and an expected pupil dilation response can be retrieved. The challenge prompt can include one or more images or a video designed to cause a pupil dilation response in a user. The challenge prompt is displayed to the user and the user's pupil dilation response is captured. The user's pupil dilation response is compared to the expected pupil dilation response. The user is authenticated based on the pupil dilation response and the expected pupil dilation response being substantially similar.

Abstract: The innovation disclosed and claimed herein, in one aspect thereof, comprises systems and methods of authenticating users. The innovation retrieves, based on an authentication request, a registered challenge prompt having a video or series of images that are designed to cause a pupil dilation response in a user and an expected pupil dilation response previously associated with the user. The challenge prompt is displayed to the user and the user's pupil dilation response is recorded. The user's pupil dilation response is compared to the expected pupil dilation response. The user is authenticated based on the pupil dilation response and the expected pupil dilation response being substantially similar.