My absolute favorite captcha to date.

http://www.josscrowcroft.com/demos/motioncaptcha/

:D Superb. What do you guys think to it?

Interesting idea but I think bots will be able to fake this much easier. More importantly, I prefer re-Captcha because it's actually doing good by digitizing content like books and maps in the process.

That's actually the most useless captcha ever.

It basically doesn't work. It's security mechanism is that the submit button is disabled until you've drawn the figure. That's it. A spammer would simply do a direct POST to the server, completely bypassing the system that is to prevent spamming.

A real captcha stores the characters server-side (in a session variable) and sends the image to the client. Finally it expects the POSTer to submit the same value as it has stored in the session variable. And that is a proper way to deflect spammers.

Quote:

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Originally Posted by TheBigB

That's actually the most useless captcha ever.

It basically doesn't work. It's security mechanism is that the submit button is disabled until you've drawn the figure. That's it. A spammer would simply do a direct POST to the server, completely bypassing the system that is to prevent spamming.

A real captcha stores the characters server-side (in a session variable) and sends the image to the client. Finally it expects the POSTer to submit the same value as it has stored in the session variable. And that is a proper way to deflect spammers.

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And even if that gets fixed...
This afternoon I wrote a piece of code, It grabs a screenshot of the website, finds the captcha image, turns it into a binary image, and I already have a pretty good idea on how to calculate the path that the mouse needs to follow. Then all I need to do is send a few mouse events and the captcha is done for.