vb.org Archive - View Single Post - Miscellaneous Hacks - Enhanced Captcha Image Verification

steadicamop · #**123** 02-07-2007, 11:01 AM

I had one determined Spam Bot make it through today - it has taken them a long time, so to increase security slightly, I've increased the number of images from 4 to 6 - if anyone else wishes to do this, here's how to:

AdminCP -> Plugins & Products -> Plugin Manager -> Extra user verification - click edit then find this code :

Code:

$amount_of_images_to_show = 4;

Change this to the number of images you want (I went for 6, adds just two extra but makes it that little bit harder for Bots):

Code:

$amount_of_images_to_show = 6;

Click Save then go to:

Styles & Templates -> Style Manager -> [Your Style] -> Edit Templates -> image_verification

In that template find:

Code:

      
<a href='register.php?clicked=1'><img src='images/verification/show.php?1' border='0' alt='VB RegSecure' /></a>
<a href='register.php?clicked=2'><img src='images/verification/show.php?2' border='0' alt='VB RegSecure' /></a>
<a href='register.php?clicked=3'><img src='images/verification/show.php?3' border='0' alt='VB RegSecure' /></a>
<a href='register.php?clicked=4'><img src='images/verification/show.php?4' border='0' alt='VB RegSecure' /></a>

All you have to do is add each line for the extra image you use - for six images this is what it looks like.

Code:

<a href='register.php?clicked=1'><img src='images/verification/show.php?1' border='0' alt='VB RegSecure' /></a>
<a href='register.php?clicked=2'><img src='images/verification/show.php?2' border='0' alt='VB RegSecure' /></a>
<a href='register.php?clicked=3'><img src='images/verification/show.php?3' border='0' alt='VB RegSecure' /></a>
<a href='register.php?clicked=4'><img src='images/verification/show.php?4' border='0' alt='VB RegSecure' /></a>
<a href='register.php?clicked=5'><img src='images/verification/show.php?5 border='0' alt='VB RegSecure' /></a>
<a href='register.php?clicked=6'><img src='images/verification/show.php?6' border='0' alt='VB RegSecure' /></a>

Either use less or more depending on how you prefer it - 6 seems like a decent enough number to make it harder for them to get in.

Hope this helps,

Jason

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