Preventing Captcha Bypass?

ChrisShaefer

New member
Feb 6, 2011
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La Jolla, CA
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I've got a couple of sites that are being fucking swarmed by forum and blog posts. All using automated captcha bypass progs to complete registration. Anyone have any tips on how to prevent this or atleast beef up the captcha?
 


The best captcha I've ever seen (recaptcha is second) is fuzzy kitten captcha.

A matrix of 9 images of various furry animals (hard to distinguish for algorithms).

The text says, choose three puppies, or choose three bunnies.

A friend of mine wrote it, not sure if its still out there, but there are probably derivatives.
 
What kind of forum are you using? In PHPbb when I switched to the 'What is the first word in this sentence' all of that stopped for me.
 
I recommend switching up the text on the registration page, adding an additional form.
 
Im using Kunena forums for a Joomla site. I just enabled reCaptcha and am also about to implement the pre-registration question. What color is the sky? etc... I like the image matrix though, going to try that as a back up. Has anyone tried using a monetizable captcha service?
 
video or image ad that the user is exposed to for about 7 secs. To solve the captcha they have to enter text from the add. If Transformers 3 comes out on July 12, the ad would play and would prompt the user to enter "July 12" to solve the captcha.
 
Captcha services and cracks can bypass most of the big ones out there. Either custom code something really simple, and hinge on it never being cracked (since, why bother? Your the only person using it. Or I'd heavily promote using "Keycaptcha". They do these little mini-puzzles, and while I'm sure it will evantually get bypassed to I havent had more than 4 or 5 (Probably paid workers) spammers get past any of my blogs/forums since I installed it about a month ago.