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Enhanced Captcha Image Verification - stop bots from signing up!!
![]() Developer Last Online: Dec 2014 ![]() ![]() ![]()
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 :
Upgrading :
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 Show Your Support
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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
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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! No members have liked this post.
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#272
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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!
__________________
Steadiforum - for Steadicam Operators worldwide No members have liked this post.
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#273
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Great mod!
Thanks : ) No members have liked this post.
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#274
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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 ![]() No members have liked this post.
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#276
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Originally Posted by RCK
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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Steadiforum - for Steadicam Operators worldwide No members have liked this post.
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#277
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Originally Posted by steadicamop
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
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Yes this seems to be working on 3.7 for me, of course I have only been using it a day.
![]() I look forward to the updated version. ![]()
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www.fosters-home.com No members have liked this post.
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#279
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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. No members have liked this post.
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#280
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Have you extended the number of picture to 8 ?
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#281
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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
__________________
Steadiforum - for Steadicam Operators worldwide No members have liked this post.
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#282
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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!
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 No members have liked this post.
Last edited by Christophe_O; 15 Jun 2008 at 21:42. Reason: p.s., p.p.s. |
#283
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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. No members have liked this post.
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#284
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Moved to 3.8 section.
__________________
Former vBulletin.org Staff Member
Cable Forum 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. No members have liked this post.
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#285
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installed, nice
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