1. A method of providing a challenge response test, comprising: receiving a request for the challenge response test; placing a well-formed image within a framework including a plurality of cells; moving the plurality of cells within the framework to generate an ill-formed image; applying a mask to the well-formed image to generate a masked well-formed image; applying the mask to the ill-formed image to generate a masked ill-formed image; and providing, in response to the request, the masked well-formed image and the masked ill-formed image, wherein the masked well-formed image includes visible portions of the well-formed image, and the masked ill-formed image includes visible portions of the ill-formed image.