reddit

“We all have seen usage of CAPTCHA(Completely Automated Public Turing test to tell Computers and Humans Apart) or HIP (Human Interactive Proof) in several website preventing spams for comments or email, protecting web services from bot attacks where programs\bots tries to imitate humans and fool the server systems. CAPTCHA is very well known way of using Alphanumeric character images in a distorted way and random orientation like below:” source...