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Enhanced Captcha Image Verification - stop bots from signing up!! Details »
Enhanced Captcha Image Verification - stop bots from signing up!!
Mod Version: 1.11, by steadicamop (Member) steadicamop is offline
Developer Last Online: Dec 2014 I like it Show Printable Version Email this Page

vB Version: 3.6.8 Rating: (63 votes - 4.89 average) Installs: 869
Released: 26 Nov 2006 Last Update: 27 Nov 2006 Downloads: 4747
Not Supported Uses Plugins Template Edits Additional Files  

Title : Enhanced Captcha Image Verification

Version : 1.1

Coder : Andy Calderbank & Jason Williams

Purpose
: Add extra Image Verification to the registration process, using an alternative system to the Captcha system.

Why : It would appear that spammers can now "read" the Captcha codes and overcome the verification process.

How : This extra feature uses images which are harder for a spam program/bot to interpret than text characters. The user has a choice of 4 randomly displayed images, and the answer is given below. The user must click on that image to proceed, if the incorrect image is selected an error message is shown. The images are randomly shown (from however many are in the directory - you can have as many as you want, just has to be more that 4!) and are automatically created from the images/verification/ directory - all on the fly. Sample images are included with this release, but you can use your own - I recommend using 100 x 100 pixels, in .jpg format and naming the image with a meaningful title (ie A House.jpg) - the extension is stripped so only the filename itself is shown.

To further enhance security, the images are passed through a script which means that none of the images on the screen have file names - and cannot be associated to the question by title alone.

I have been testing this on my forum and have found it to be effective - I cannot guarantee that this will stop all spamming, but this relies more on human input than a computer "reading" the image.

Important : This has been tested on 3.6.2 - I cannot guarantee it will work on anything above, please test with caution - and as always BACKUP FIRST! This will not work on anything below 3.6.0.

Demo : http://www.steadiforum.com/register.php

I hope this is help to the VBulletin community as I know this is a growing problem. I don't fancy the thought of trawling through hundreds of new members deleting stupid usernames and spam posts.

Installation :
  1. Upload the verification/ directory to your images/ folder - make sure .htaccess and show.php are present - otherwise it won't work.
  2. Import Product - product-image_verification.xml

Upgrading :
  1. Upload show.php to the images/verification/ directory.
  2. Import Product - product-image_verification.xml - select Allow Overwrite to enable upgrade.

Requirements : GD Libraries installed

File uploads : 39 (including images)
Files to Import : 1
New Templates : 1
New Phrases : 5
Uses Hooks : 1
New Queries : 0

History :
v1.0 - Original release
v1.01 - Slight code change for forums in sub-directories (thanks go to Barakat for solving this one)
v1.1 - Issue resolved with Windows servers also template clean up for xhtml compliance
v1.11 - Added version check function, minor upgrade.

Done - if you like please click install! (and I won't ask for any donations as long as you click Nominate for MOTM!)

Don't forget you don't have to use the provided images - you can customise these to any you wish - I've used ones that are hopefully universal and everyone will recognise.

Download Now

Only licensed members can download files, Click Here for more information.

Screenshots

Click image for larger version

Name:	imageverification1.jpg
Views:	8559
Size:	36.6 KB
ID:	56611   Click image for larger version

Name:	imageverification2.jpg
Views:	4463
Size:	24.5 KB
ID:	56612  

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  • This modification may not be copied, reproduced or published elsewhere without author's permission.
Similar Mod
Mod Developer Type Replies Last Post
Miscellaneous Hacks Enhanced Image Captcha - Stop bots from signing up! steadicamop vBulletin 3.7 Add-ons 165 21 May 2015 01:36

  #271  
Old 24 May 2008, 11:27
AdrianH AdrianH is offline
 
Join Date: Sep 2007
Hi Jason, having re-read that post http://www.vbulletin.org/forum/showp...&postcount=122 I have edited the style templates and can confirm that this is working perfectly in v3.7.

I now have 8 images and the phrases are displayed correctly.

Good luck with the next version!
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  #272  
Old 24 May 2008, 19:18
steadicamop's Avatar
steadicamop steadicamop is offline
 
Join Date: Jul 2004
Real name: Jason Williams
Glad you got it going ... currently testing out on 3.7, I see it's working fine, now going to work on adding AdminCP options for number of images .... image directory - I can't think of any other items I could add ... suggestions welcomed!
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  #273  
Old 25 May 2008, 08:45
Artes_Marciales Artes_Marciales is offline
 
Join Date: Jun 2007
Great mod!
Thanks : )
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  #274  
Old 26 May 2008, 22:35
RCK's Avatar
RCK RCK is offline
 
Join Date: Jan 2002
Originally Posted by steadicamop View Post
Suggestions welcomed!
I have one idea, most of user will use the default images you provide, and the only failure of this script is that image final size won't change. I can imagine bot will easily know "default" picture size, and click on the good one depending of the question !
One easy fix for this would be to randomly change the jpg output quality in GD from 70 to 100%, this way, each page reload would really display 'new pictures' to spam bots

anyway, it's a very cool mod, I can't wait 3.7 official version
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  #275  
Old 29 May 2008, 05:01
tehblob tehblob is offline
 
Join Date: Apr 2008
thanks a lot :P
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  #276  
Old 01 Jun 2008, 18:43
steadicamop's Avatar
steadicamop steadicamop is offline
 
Join Date: Jul 2004
Real name: Jason Williams
Originally Posted by RCK View Post
I have one idea, most of user will use the default images you provide, and the only failure of this script is that image final size won't change. I can imagine bot will easily know "default" picture size, and click on the good one depending of the question !
One easy fix for this would be to randomly change the jpg output quality in GD from 70 to 100%, this way, each page reload would really display 'new pictures' to spam bots

anyway, it's a very cool mod, I can't wait 3.7 official version
Your suggestion has been noted, I have another idea with this, to make different size images, that was that could also fool the bots ... just want to give as many possibilities as I can.

I'm away for a week now but will get the latest version going as soon as I can ... should also be backwards compatible I hope!
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  #277  
Old 02 Jun 2008, 08:50
DiverTree's Avatar
DiverTree DiverTree is offline
 
Join Date: Jun 2006
Real name: Diver
Originally Posted by steadicamop View Post
Sorry for the lack of support and input -- have been busy elsewhere and have let this slip.

I've noticed a few things - could anyone confirm if this is now a standard part of VBulletin 3.7.0? Just curious as no one has mentioned it to me....

Also if not and people are installing on 3.7 and if this works ok or not, I have seen a few which do and some which don't ... if there are any common issues on that I will do my best to resolve, although I'm still on 3.6.2!
Originally Posted by steadicamop View Post
No errors whatsoever on 3.7? I might just go ahead and re-release it for 3.7 until I can upgrade myself and add new options.
working fine on 3.7.0 for me ... somebody said it was stock in 3.7 series but no one has yet found it. seems to be working like a charm. like with my 3.6.8 board, it stopped the bots dead in their tracks and users have sucsefully registered without issue.
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  #278  
Old 04 Jun 2008, 03:53
NeitherSparky's Avatar
NeitherSparky NeitherSparky is offline
 
Join Date: Aug 2006
Real name: Sparky
Yes this seems to be working on 3.7 for me, of course I have only been using it a day. I did use my own images as I have a themed board...it isn't necessary to match the exact same number of images used by default is it? I could use more or fewer couldn't I?

I look forward to the updated version.
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  #279  
Old 07 Jun 2008, 05:33
ngx's Avatar
ngx ngx is offline
 
Join Date: Jan 2005
Hi Steadi. I just installed this about 30ish hours ago, and so far 5 bots have signed up. I either have some very persistent bots who just keep clicking until they strike it lucky, or they have found a way around it. *sigh*

Thanks anyway.
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  #280  
Old 07 Jun 2008, 09:49
RCK's Avatar
RCK RCK is offline
 
Join Date: Jan 2002
Originally Posted by ngx View Post
Hi Steadi. I just installed this about 30ish hours ago, and so far 5 bots have signed up. I either have some very persistent bots who just keep clicking until they strike it lucky, or they have found a way around it. *sigh*

Thanks anyway.
Have you extended the number of picture to 8 ?
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  #281  
Old 07 Jun 2008, 21:08
steadicamop's Avatar
steadicamop steadicamop is offline
 
Join Date: Jul 2004
Real name: Jason Williams
Rightho ... version 2 is out now - get it here - http://www.vbulletin.org/forum/showthread.php?t=181818

Updated with AdminCP options and new images, should work better, but at beta status as there are a few changes which need fully checking.

Jason
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  #282  
Old 13 Jun 2008, 22:43
Christophe_O's Avatar
Christophe_O Christophe_O is offline
 
Join Date: Jul 2002
P.P.S. Sorry STEADICAMOP I did not notice your above message: this is an obsolete thread! New version:
Enhanced Image Captcha 2.2b

I came here following a reference by Indie2Industry in the Vbulletin.com thread: Spam bots defeat Recaptcha.

I like this hack!
  • So simple, no messing with IP databases, etc.
  • I believe much new spam is from 'spamborgs' not bots: humans who do not speak English, acting like trained monkeys. People who speak English generally command a higher salary and their time is too costly for this petty spam. That is why I believe this program will be effective.
  • Allows each forum to use different images, thus more difficult to program a robot or train a human to answer correctly at numerous forums.
  • Much better for the legitimate visitor than ramping up the obscurity of character recognition.
I am not ready to use this hack yet (my forum just started) but voted anyway as MOTM. I am posting this reply to add a few tips and suggestions, based on my testing today at Steadiforum.com (3.6.2) and TheBlueRoomForum.org (3.7.1).
  • Test the 'back' button after clicking the wrong image with Firefox (20% traffic) as well as Explorer (about 80%). Test both the back button on the browser and clicking the word 'back' on the error page. (Some bugs here. Maybe the hack needs automatically to 'refresh'.)
  • With Explorer 7 and high speed cable, some of the images at Steadiforum.com did not readily download to my browser. I suggest that all the images files be kept strictly below 4k.
  • There are some people from every country who speak English well enough to be good forum members. But may not know Homer Simpson. I suggest keeping the labels generic such as "bald man".
  • I don't know if blind people using 'aural readers' can navitate Vbulletin. But if so, they should be directed to a contact form for sign-up.
  • I suggest that maybe the directional words such as 'bald man' also be converted to an image? That way, illiterates can not compensate by using translation software. Also 3 directional variations for each image. Example: bald man, hairless person, cartoon man.

P.S. I think this program works well partly because it is not commonly used. This program seems to be especially effective against the current wave of semi-human robots who have trouble reading English.

However, if more widely used, then perhaps added complications may be needed. The choices are limited to about 15, and we must allow 3 tries to be human-friendly. Thus, robots can get through 1/5 the time by guessing. When guessing wrong, they cycle through all other forums, returning the next day until they finally will get through. Maybe this could be overcome by shutting down any IP which sends a guesser three times in three days.

Another option would be to create 2-3 multiple-choice options instead of just one. I.e., the verification page might consist of 2 or 3 challenges to choose the correct image from a row of 7-10 images. The visitor could be asked to check a box beside the correct image, 2-3 times. Still simple for humans, and only requiring a download of 14-21 images, but offering 49-343 possible answers.

P.P.S. Sorry STEADICAMOP I did not notice your above message: this is an obsolete thread! New version:
Enhanced Image Captcha 2.2b
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Krystof
Starnectar Forums

Last edited by Christophe_O; 15 Jun 2008 at 21:42. Reason: p.s., p.p.s.
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  #283  
Old 05 Oct 2008, 00:35
shawn911 shawn911 is offline
 
Join Date: Jan 2007
How do i translate this in French ?
I was looking for a language file.
But there is nothing.
Do i need to go to the Admin CP to translate it ?
If yes, how and what variables to translate ?

Thanks in advance.
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  #284  
Old 10 Jan 2009, 13:32
Paul M's Avatar
Paul M Paul M is offline
 
Join Date: Sep 2004
Real name: Paul M
Moved to 3.8 section.
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Please do not PM me about custom work - I no longer undertake any.
Note: I will not answer support questions via e-mail or PM - please use the relevant thread or forum.
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  #285  
Old 10 Jan 2009, 14:02
RedDevil's Avatar
RedDevil RedDevil is offline
 
Join Date: Mar 2008
Real name: Steve
installed, nice
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