Position Paper) Motivating the Need for Evaluation Criteria for Captchas
Gerardo Reynaga · 2012
We argue that a set of usability heuristics are needed for easy and quick evaluation of Captchas implementations. With this set of heuristics we contribute to sustain the Captcha Mantra: “Easy for humans, hard for machines”. In particular, the usability of Captcha schemes change radically when utilized on mobile environments. We are developing a set of heuristics for use by practitioners wishing to evaluate which Captcha scheme is most appropriate for their website.