Innovation on CAPTCHAs

When posting comments on a blog or registering for web services, you probably asked to read a CAPTCHA to ensure that you are a human and not a bot.

To prevent the CAPTCHA being cracked by bot, some websites present very hard to read CAPTCHAs, but none of them is as hard as this one...


Source: Wellington Grey

Some people are even thinking of commercialize the CAPTCHA...like this one..

Source: JY's Weblog