Click to play videoNew Delhi: Before you sign into any website, you have to prove that you are a man or a woman in other words you are a human being and not a software that is trying to hack in, and that is where CAPTCHAs (Completely Automated Public Turing Test to Tell Computers and Humans Apart) come in.
Simply put, a CAPTCHA is a set of letters and numbers distorted in such a way that they are easier for a human to read than for a software programme to decode.
The system helps stop web robots, or software programs from hacking in and corrupting the service of the site.
However, the problem is, as the web robots became smarter, the CAPTCHA puzzles have grown more and more tough, even for humans to understand.
Created by Vohn Ahm and Blum in 2000 for yahoo, the puzzles website CAPTCHA has come a long way from simple distortion, to adding angled lines, to double puzzling, to bilingual to plain weird.
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