After numerous requests we have finally released a completely new Dracon Flash CAPTCHA v2.1
for your everyday use. It addresses OCR attacks and comes with a fully AJAXed test email form
measures and facilitates a 128bit AES encryption
between PHP and Flash.
Your server needs to run PHP
compiled with MCrypt
support, but if you are an advanced user you can easily write your own scripts using your preferred programming language.
Quick and simple version
Random zoom with mouse interaction
Strong against timed-OCR attacks
: PHP w/ MCrypt library
: These CAPTCHAs are FREE to download and use according to the Dracon License
. In simple words it means you can modify anything you wish but you need to keep the backlink
intact. Or buy a domain certificate for $10 and enjoy a complete ownership and an encrypted flash file that's not
possible to reverse engineer
to get your secret keypass.
ublic Turing test
to tell C
omputers and H
part", trademarked by Carnegie Mellon University
) is a type of challenge-response
test used in computing
to determine whether or not the user is human. The term was coined in 2000 by Luis von Ahn
, Manuel Blum
, Nicholas J. Hopper of Carnegie Mellon University, and John Langford
. A common type of CAPTCHA requires that the user type the letters of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen.
Because the test is administered by a computer, in contrast to the standard Turing test that is administered by a human, a CAPTCHA is sometimes described as a reverse Turing test
. This term is ambiguous because it could also mean a Turing test in which the participants are both attempting to prove they are the computer.
For further information visit the The CAPTCHA Project
Older version of Dracon CAPTCHA
v1.3 uses letter scrambling and no real encryption. It is just as prone to OCR attack as other image based solutions. But if you are interested in trying it you can download it for testing from here
The Dracon CAPTCHA
to break it with OCR
it is nearly impossible
to break it with a workaround
This Flash CAPTCHA
script has two versions, one is extremely simple to install and is less secure, but takes less than 1 minute
to install. If you have only a small web form
that is targeted by spam
only thanks to google and other search engines, but there is no reason why to attack your site for a special purpose
, you can choose the simple version because no general tool will break it automatically without extensive tweaking.
The second version is more secure
, can protect against automatic submissions
of your forms, comments, blogs or url submissions and reverse engineering would take a while, if anyone feels like proving it inefficient
: The third version is even more secure
. Thanks to reports of vulnerability in previous versions the communication and code transaction has been encrypted to prevent packet sniffing from gaining direct access to the security code. There also have been thoughts about OCR
style attacks, but that is a different approach requiring different skills
and we will deal with them after a report of success. As before, please feel free to try to break it with a robot
and kindly let us know if you succeeded.