Jigsaw puzzle:Construction and evaluation for scheme of CAPTCHA
Wu Yan · Jisuanji gongcheng yu sheji · 2010
To improve the security of the most CAPTCHA in current online system,a new scheme for CAPTCHA(completely automated public Turing test to tell computers and humans apart) with the jigsaw puzzle is presented,which can prevent from breaking by the tech-nology of optical character recognition and exterior contour recognition while keeping ease of use.Based on this idea,four approaches are implemented respectively after several researches.Then some benchmarks including browser compatibility are performed to estimate the performance of each approach respectively.According to the result of evaluation,the best approach with clustered image combined cookie is recommended.