1. A computing device for authenticating a user, the computing device comprising: an image capture module to: capture an image of a user; and identify the user via at least one facial recognition technique applied to the captured image of the user; a presentation module to present, in response to a determination that the user has at least one stored profile, an initial image associated with a stored profile of the user; an input module to receive input comprising at least one manipulation of the initial image to transform the initial image into a manipulated initial image; and an authentication module to authenticate the user in response to the manipulated initial image matching a target manipulated image associated with the stored profile of the user, wherein the target manipulated image comprises the initial image manipulated by the at least one manipulation.