Hi Saurabh,

I LOVE the idea you've come up with here, so I'm glad to help if I can.

The spam I was seeing here on this blog wasn't from trackbacks or pingback, but was the usual comment spam (meds related) I'm used to seeing which I've always assumed was created by bots.

I've always thought it safe to assume it was from bots as a real person wouldn't continue to post spam when it was clearly going into moderation. Although having said that, it's entirely possible it was all from different people.

Over the last couple of years I've read that for instance various big-name captcha systems have been broken, and even semi-automated work rounds developed where the bot software presents a pop-up to the user for them to manually enter the code.

Maybe something like that is going in the case of Clickcha? Spammers do seem to work really quickly nowadays and also seem to have money or the skills to develop workarounds at speed.

Here's a couple of thoughts for an alternative.

Maybe supply a graphic of some sort, and some radio buttons? Click the correct radio button before clicking submit.

I also had a suggestion for using Figlet to create a non-graphical captcha that would work on servers that didn't have GD support.

I hope this helps.

-Frank