CAPTCHA

Method for recognizing if a user of an electronic terminal is a human or a robot

A method to recognize whether a user of an electronic terminal is a human or a robot is described. This method provides to take an image and decompose the image in a multitude of image portions. The image portions are randomly visualized inside a …

CAPTCHaStar! A novel CAPTCHA based on interactive shape discovery

Over the last years, most websites on which users can register (e.g., email providers and social networks) adopted CAPTCHAs (Completely Automated Public Turing test to tell Computers and Humans Apart) as a countermeasure against automated attacks. …