CAPTCHA: Is it a Panacea For All Spamming Problems?

CAPTCHAs (Completely Automated Public Turing Tests to Tell Computers and Humans Apart) need no introduction. All of us who have used the internet, have come across some or the other CAPTCHA while creating a new account, filling online forms or downloading software. The main aim of CAPTCHAs is to prevent spam, so when a CAPTCHA [...]