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I saw this in use on someones blog today: http://www.webdesignbeach.com/beachbar/ajax-fancy-captcha-jquery-plugin

I've had a long standing hatred of Captcha's, even though they are a necessary evil. It frustrates me when I have to squint to try and read the text, or when I stuff it up 2 or 3 times. It's a barrier to user contribution, but unfortunately due to the nature of the internet we need to use it.

I quite liked the look of this fancy captcha plugin though - simple, stuff you would do as a child, yet should be fine to block the bots. It's a jquery plugin too, I believe that stack overflow uses that.

If this plugin isn't quite right, perhaps a similar concept could be developed by stack overflow?

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This just reminds me of Kitten Captcha. Could easily be converted into Waffle Captcha, Unicorn-Captcha or [your-favorite-meme-here]-Captcha. – Pops Oct 24 '10 at 4:24
    
On an almost completely unrelated note, what is with websites that use Flash to display section headers - in this website's case, just plain text? – Jared Harley Oct 24 '10 at 4:40
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@Jared - That would be sIFR: a method for getting non web-safe fonts for your website before @font-face became widely supported. – Yi Jiang Oct 24 '10 at 4:42
    
@Yij Interesting - thanks! I only noticed since I started running Chrome in "click to play" for plugins – Jared Harley Oct 24 '10 at 6:15

One key difference is that we allow posting with JavaScript disabled, and ReCaptcha supports this.

So that's a dealbreaker.

On top of that, I'm not a fan of these drag and drop captchas as they also break users who navigate with the keyboard or are blind.

Not really an option.

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And the reason they aren't cracked yet is that nobody serious uses them. There's really nothing going on there that wouldn't be trivially solvable. – Paul McMillan Oct 24 '10 at 6:03
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Not only breaking it for keyboard users, but I just tried their example on my iPhone, and you can't use the captcha on a touchscreen interface - seeing as how big mobile computing is, well, I think that's a dealbreaker too. – Jared Harley Oct 24 '10 at 6:19
    
I would wager that 150 rep would get that particular captcha solved with a drop-in solution in less than half a day. If not that, 500 would certainly do it. – Paul McMillan Oct 24 '10 at 10:08
    
Fair enough, thanks Jeff. – RodH257 Oct 24 '10 at 22:35

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