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Enhanced Image Captcha - Stop bots from signing up! · **Released**: 06-06-2008

Title : Enhanced Image Captcha

Version : 2.2b

VB Versions : Currently working and tested on 3.8.4 (as of Dec 2014)

Coder : Andy Calderbank & Jason Williams

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

The Enhanced Image Captcha system is a unique system using images versus text to stop spammers signing up to your forum. The script automatically detects images and uses the filename as the title, making adding new images extremely simple. To further improve 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 - and cannot be viewed by trying to access the images directly.

Please note, there is a .htaccess file within the images directory, to keep security tight, this must be kept, without it bots are able to scan the images and make a match, I understand not every server can utilist .htaccess but cannot get around this.

Important : This has been tested on 3.7 and 3.6.2 - as far as I know this should be backwards and forwards compatible.

My thanks go to all the guys who have helped with this, all the suggestions and feedback, all has been take on board and where necessary included in this new version - members in particular are : King Kovifor, Danny.VBT, Lynne and RCK.

Also thanks to ogameclub for the Turkish translated version.

I must thank Opserty too for their hard work in making me understand where I was going wrong!!

New features from original 1.11 release!!

Admin settable options:

Number of images to display
Path to image directory (so you can change if you prefer)
Resize image between 50% - 150% of original image
Number of images to display before a line break (see History)
Enable/Disable

Demo : http://www.steadiforum.net/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 :

Upload show.php to your forum root directory (or wherever register.php is).
Upload the images/verification directory, this can be moved to the forum root or have the verification name changed, but needs updating in the Enhanced Image Captcha AdminCP options.
Import Product - product-enhanced_image_captcha.xml
Make sure that you check that the Images Path is correct in AdminCP -> VBulletin Options -> Enhanced Image Captcha.
You can also select how many images and what size from the original you would prefer.

Upgrading:

Import Product - product-enhanced_image_captcha.xml - overwrite if necessary.
Set any options you need in AdminCP -> VBulletin Options -> Enhanced Image Captcha.

Upgrading from v1.xx :

Remove the images/verification directory and all images inside.
Uninstall the product - Enhanced Captcha Image Verification - important for phrase and template removal!
Upload show.php to your forum root directory (or wherever register.php is).
Upload the images/verification directory, this can be moved to the forum root or have the verification name changed, but needs updating in the Enhanced Image Captcha AdminCP options.
Import Product - product-enhanced_image_captcha.xml - overwrite if necessary.
Make sure that you check that the Images Path is correct in AdminCP -> VBulletin Options -> Enhanced Image Captcha.
You can also select how many images and what size from the original you would prefer.

Requirements : GD Libraries installed

File uploads : 53 (including images)
Files to Import : 1
New Templates : 2
New Phrases : 15
Uses Hooks : 1
New Queries : 0

History :
v2.0b

Original Beta release

v2.1b

Added Enable/Disable Option
Also added Turkish Translated version
Added new image page

v2.2b

Bug Fix : Opera browsers, any number over around 8 images disappears over side of screen, added number of images before line break function to stop this happening

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.

Kirauni · #**152** 08-26-2011, 09:48 AM

Yes, so do I. I've upgraded my board to vb4 and now this hack doesn't work anymore. Too bad

Vcize · #**153** 10-27-2011, 03:36 AM

This isn't working for me at all. Nothing shows up on the registration page, it's exactly the same as it was before. I uploaded images/verification and the path in the settings is set to there, but still nothing. It's not even just broken text or anything, there's nothing new on the registration page, no text or anything.

I tried the default theme as well, still nothing.

EDIT: Weird, it works on my 3.8.6 forum but not my 3.8.7 PL2 one.

panraf · #**154** 02-22-2012, 10:14 AM

It is now working, although i check the correct image it is always says wrong.....uninstalled on vbulletin 3.8.7

LIGHTFRAG · #**155** 03-23-2012, 08:15 AM

vb3.8 fix2 It's bug. I found one error
If you view the code under the picture, we see forum_root / show.php
If you then type into the browser the path http://myforum/show.php it displays the forum is:

PHP Code:


			
Warning: imagecreatefromjpeg() [function.imagecreatefromjpeg]: 'images/verification/' is not a valid JPEG file in [path]/show.php on line 22

Warning: imagecreatetruecolor() [function.imagecreatetruecolor]: Invalid image dimensions in [path]/show.php on line 27

Warning: imagecopyresized(): supplied argument is not a valid Image resource in [path]/show.php on line 28

Warning: Cannot modify header information - headers already sent by (output started at [path]/includes/class_core.php:3283) in [path]/show.php on line 30

Warning: imagegif(): supplied argument is not a valid Image resource in [path]/show.php on line 31

Warning: imagedestroy(): supplied argument is not a valid Image resource in [path]/show.php on line 32

ryancooper · #**156** 09-02-2012, 11:10 AM

I would like to see this for v4 as well

TY

bada_bing · #**157** 09-05-2012, 03:27 PM

I have installed this on my 3.8.x site and seems to work OK so far however I have a product called VB Vendors that only allows you to choose verification options via VB's Human Verification Options menu. This product is not listed in that menu so I cant choose it. Is there a way to make this option be part of the vb- Human Verification Options ?

Also on a side not how can I customize the images and phrase question to match my sites theme ?

Thanks

Mahoni999 · #**158** 09-14-2012, 07:45 AM

I get an Error trying this Mod:

Warnung: dir(images/verification) [function.dir]: failed to open dir: No such file or directory in [path]/register.php(204) : eval()'d code (Zeile 9)

Fatal error: Call to a member function read() on a non-object in /var/www/vhosts/arcade-palast.de/httpdocs/forums/register.php(204) : eval()'d code on line 10

Any Help with that?

BirdOPrey5 · #**159** 09-17-2012, 08:55 AM

Seems like your image directory doesn't exist or your "Path to image directory" in your settings is wrong.

basskiller · #**160** 11-20-2012, 05:17 PM

works well in 3.8.6

X-or · #**161** 08-01-2013, 05:58 AM

No plan for vb4?

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