in a reverse turing test an applicant seeking access to a computer process is presented with an image containing human - readable data that is intended to be inaccessible to an automated process or bot . in an improved reverse turing test the applicant is presented with multiple sub - images that have to be rearranged in order to yield the overall image . this does not substantially increase a human applicant &# 39 ; s difficulty in dealing with the test , but makes it much more difficult for a bot to interpret the image .