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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: 873
Released: 26 Nov 2006 Last Update: 27 Nov 2006 Downloads: 4774
Not Supported Uses Plugins Template Edits Additional Files  

Title : Enhanced Captcha Image Verification

Version : 1.1

Coder : Andy Calderbank & Jason Williams

: 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 :

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.


Click image for larger version

Name:	imageverification1.jpg
Views:	8620
Size:	36.6 KB
ID:	56611   Click image for larger version

Name:	imageverification2.jpg
Views:	4499
Size:	24.5 KB
ID:	56612  

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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

Old 23 Jul 2009, 02:03
maxignition maxignition is offline
Join Date: Jun 2009
Looks good, I'll reserve in case I need it.
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Old 26 Jul 2009, 21:03
LieuR LieuR is offline
Join Date: Feb 2009
You cant disable this plugin ? Or i have to remove it if i want to disable it ?
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Old 12 Aug 2009, 17:09
Dreamgun Dreamgun is offline
Join Date: Mar 2002
Been using this for months without bot issues, 10+/- registrations a day. The script works, but it's generating errors somewhere and placing them into an error_log file on my host's server.

Block Disabled:      (Update License Status)  
Suspended or Unlicensed Members Cannot View Code.

There are some, any idea? Is it possible it's bots generating these?
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Old 26 Aug 2009, 03:17
-=Leb=-'s Avatar
-=Leb=- -=Leb=- is offline
Join Date: Jan 2008
gj on this great plugin
For You Who Like To Play CounterStrike Source, Check Our Website At:
FireWaLL Website
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Old 26 Aug 2009, 17:30
k1klass k1klass is offline
Join Date: Dec 2007
3.8.3 and get internal server error when clicking register button, disable and runs normal
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Old 27 Aug 2009, 00:37
Itchy Nips's Avatar
Itchy Nips Itchy Nips is offline
Join Date: Jun 2009
i installed this today, disabled one of my other mods that cross references IP's and usersnames with a known db of spammers. I got two spammers registered on my forum, today. I had the other mod installed for over about a month and I didnt get a single spammer.

I have checked and verified that this mod IS working but spammers are still making it thru.

any ideas?
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Old 08 Oct 2009, 10:49
RrCoX22's Avatar
RrCoX22 RrCoX22 is offline
Join Date: Dec 2006
how do you go about editing in a picture that I would like to be used for every question/registration?
4th F-Body | Norcal 4x4 Forum | Norcal GM
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Old 15 Nov 2009, 01:30
hyperspin hyperspin is offline
Join Date: Jun 2008
This mod doesn't appear to be working on my site now... When the correct image is clicked on it says that the image clicked was incorrect.

We just recently upgraded our webserver and moved the site, but I don't see anything that would be causing this to be happening.

We did just upgrade to 3.8.4, but I read above that it was working on 3.8.4.
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Old 29 Nov 2009, 20:27
hyperspin hyperspin is offline
Join Date: Jun 2008
Any ideas as to what needs to be updated on this mod to get it to work with 3.8.4? Since this mod broke our forum has been getting nailed by spammers and with this mod it kept out a BIG majority of the spammers.

This appears to be some kind of session problem that's happening on 3.8.4

Last edited by hyperspin; 29 Nov 2009 at 21:37.
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Old 01 Dec 2009, 11:19
KubisForce KubisForce is offline
Join Date: May 2006
I would also love to see this with vb 3.8.4.

Does it work with 3.8.1?
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Old 03 Dec 2009, 16:35
Biker_GA Biker_GA is offline
Join Date: Oct 2004
I've been using this with 3.8.4 and it works just fine.
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Old 03 Dec 2009, 23:05
KubisForce KubisForce is offline
Join Date: May 2006
Have you installed it with 3.8.4? Or earlier?
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Old 09 Dec 2009, 15:40
freewilley's Avatar
freewilley freewilley is offline
Join Date: Jan 2009
Installed and working perfectly on 3.8.4 . Thanks
Techno2day | Narutoshare
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Old 30 Dec 2009, 06:56
Vackrick Vackrick is offline
Join Date: Apr 2008
Real name: Matt
can anybody update this to vB 4 Gold Version
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Old 06 Jan 2010, 23:06
dtommy79 dtommy79 is offline
Join Date: Jul 2007
Yeah, this would be great to be able to use it on vb4. Please update this mod
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