vb.org Archive - Miscellaneous Hacks - Enhanced Captcha Image Verification

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- - Miscellaneous Hacks - Enhanced Captcha Image Verification - stop bots from signing up!! (https://vborg.vbsupport.ru/showthread.php?t=132482)

feldon23

11-29-2006 10:31 PM

Quote:

Originally Posted by el fuego (Post 1128330)

Could you have it re-order the 4 pictures each time they are presented? So that a click on image #1 would sometimes be correct and sometimes not? Also have the required image name be changed. For instance, one time it asks for the butterfly, the next it may ask for the soccer ball (randomly of course), and each time it changes both the question, and the location of the proper response?
Possibly also expand the hack to include many more possible images, but only randomly choose 4 at a time to display.
Along with your idea of a 24hr lock out for "x" amount of wrong answers, this could be a formidable hack.

I'm no coder... so I have no idea how hard this would be. But it seems to me that this randomness would keep the Bots at bay for quite some time.

The answer to that is not programming, but adding no-cache headers.

Garyk

11-30-2006 01:00 AM

1 Attachment(s)

i cant get the images to show up i am running a 3.6.2 forum heres a screen shot

JD45	11-30-2006 02:51 AM

Quote:

Originally Posted by Garyk (Post 1128418)

i cant get the images to show up i am running a 3.6.2 forum heres a screen shot

Same thing for me on a 3.6.4

steadicamop

11-30-2006 07:23 AM

Quote:

Originally Posted by feldon23 (Post 1128354)

The answer to that is not programming, but adding no-cache headers.

In the show.php file - no cache headers are sent :

PHP Code:


		
			
header("Cache-Control: no-cache, must-revalidate");

I have noticed that when you click back it sometimes doesn't show correctly, I'm busy with work at the moment but dedicating as much time as I can to fixing any issues and making it virtually bullet-proof.

Jase

steadicamop

11-30-2006 07:35 AM

@ GaryK & JD45:

First thing - check to make sure you have the GD libraries installed - see this post. If you don't have GD installed it won't work - if it is installed try this -

Check the structure of the images - they should be:

forum root/images/verification

Here's something to check if that is all correct, in templates check image_verification, and find this code:

PHP Code:


		
			
images/verification/show.php

Change it to your server root ie

PHP Code:


		
			
server root/forum/images/verification/show.php

Make sure that ?1 through to ?4 is kept after show.php otherwise it won't work.

If all else fails PM your site details and I can take a look.

HTH

Jason

redspider

11-30-2006 08:14 PM

1 Attachment(s)

I notice today that the radom images dont work well in my forum see attachemnt .

steadicamop

12-01-2006 01:31 AM

Hmmm that's very unusual - try holding Ctrl and pressing F5 or refresh and see if that clears it up - it shouldn't cache any image but it's the only thing I can think that's causing it - if you still have problems let me know I can take a look into it.

Cheers

Jason

Stavs16

12-01-2006 02:04 AM

test on 3.6.2, does not work... upgrading

steadicamop

12-01-2006 01:49 PM

This is very unusual, it should work on 3.6.x - I'm eager to know why sometimes it doesn't work.

I might put together a quick FAQ.

Jase

soniceffect

12-01-2006 05:53 PM

Did you find an answer to garyk's problem above? I have the same issue

All times are GMT. The time now is 03:53 PM.

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