Friday, February 27, 2009
I'm sure you all must have seen a captcha even while commenting in my blog or while registering for an email account. This is typically to prevent automatic programs (a.k.a Bots) to prevent creating spam accounts or messages.
I've been also working offline on handwritten Captchas that are hard to crack as these days printed and twisted Captchas are cracked using OCR and Image Processing techniques (also simple dictionary words or grammar rules).
So to add more intelligence people are coming with innovative Captchas and the one below actually asks you to solve a simple math (as seen above)!
Read more about Captcha at Wiki.
Towards a Spam free Internet !