Ads Captcha

Current Captchas are based on distorted alphanumeric characters (text based Captcha) displayed to user before registration to all kind of online platforms such as forums, blogs and sharing knowledge websites like wikipedia or Yahoo! Answers. After the user has deciphered the Captcha, he may continue to contribute a comment or any other action he is interested in.

Unfortunately, automated hackers become more and more sophisticated these days, but the more they become sophisticated – the more Captcha becomes difficult. Consequently, more human users give up login to sites with difficult Captchas, not to mention disabled users with cognitive problems such as dyslexia, or physical disabilities such as blind persons – they are denied access to Captcha right from the beginning!

Image based Captcha is the latest alternative to current text based Captcha. It’s based on a set of images easier to be recognized and classified by human users than traditional textual Captcha, yet at the same time, much more difficult for robot hackers.

How does it work?
Very easy. It only takes a few steps to be solved. First, a set of images with letters above are displayed. The user is being required to identify and click on a sequence of images. After he completes correctly the test and is verified as a human – he is allowed to carry on his online session. It’s easy, funny, not boring as a text based Captcha.

VidooCAPTCHA is an example to an image based Captcha.

In case you haven’t heard about it – the phpBB website was running a captcha plugin competition.
New entries are not allowed anymore, meaning we can get to see some new captcha plugins very soon now.
This captcha plugin competition was held because of the upcoming release of phpBB new version (phpBB 3.0.6) which will include a completely new captcha system.
Niceeee…

About phpBB
Since phpBB is released under the GNU General Public License the bulletin board software it offers is completely free
and is used for communities creation.

What is captcha for?
Captcha system is used on the online sphere as a method of verifying a user as a human being. Since some websites (such as forums & blogs for example) might be attacked by bot spammers sending endless garbage data, links or ads, they use captcha service as a mean of spam prevention.

Defeating Captcha?
Most Captchas contain distorted letters or alphanumeric characters. Some Captchas display a mathematic problem, logical questions, audio letters or words for blind people, all are easy to be deciphered by human beings but not by robots. Yet currently scientists are working hard on developing robot computers which are capable to pass the captcha test, meaning they manage to crack it. Currently the statistics stands on the fact that 1 out of 5 Captchas is being cracked.

3D Image Recognition captcha
What can be done to stop this captcha bot cracking? Websites can use a different kind of captcha based on a 3 dimensions images. 3D Image Recognition Captcha is unbreakable by robots so far, since it requires a function of a human brain.

How does the 3D Image Recognition Captcha work? One or three 3D images are displayed. Than the user is required to click on another box which opens and shows another 9 3D images. Among those 9 images, 3 are identical to the formers but rotated. The user has to match them consequently with 3 empty boxes. A human brain can discern the images easily but no robot has a perception of discerning rotated images… not yet! Therefore, 3D Captcha image is a marvelous spam blocker..