[KeyCAPTCHA]

Originally Posted by Hornstar

You might get more exposure on this if you release a VB4 version on vb.org and include stop spam in your title as many users will no doubt be looking for hacks on vb.org since reCaptcha has been cracked.

Hornstar, wow,
We seemed to initially miss this your third already helpful to us hint to understand why there are so many requests for having more than one protection (in earlier posts by inciarco and by Kestryll

After some googling we found that many articles on internet advise to install second protection as the (only?) way to stop the spam surge due recent reCAPTCHA (used by vBulletin forums) cracking on 4th of January 2011.

We should stress that reCAPTCHA cracking was quite obvious and expectable, due to may reasons, suffices to say that Google Inc., owning the reCAPTCHA, does not use it by its own services, for ex., Gmail registration, etc. Some obvious weaknesses of reCAPTCHA were already explained on internet before.

Though, KeyCAPTCHA is conceptually different service having multiple levels of novel mechanisms of protection and it was never cracked yet.

KeyCAPTCHA anti-spam service is unique in that it is platform specifically developed to overcome many drawbacks of other (previous) anti-spam services. For example, in contrast to other captchas, KeyCAPTCHA allows to easily and fast change the type of employed captcha without the need to re-install its plugin in protected webservers of our old customers, in case it is broken.