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.: Visual Flash CAPTCHA - Completely Automated Public Turing test to tell Computers and Humans Apart :.
   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 with anti-hammering 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
Multi-colored version

Requirements: PHP w/ MCrypt library

Important: 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.

Inverse with a backlink
Purchase a license - $10 / domain



Detailed How-To

Clean professional version
Blue with forced mouse interaction

A CAPTCHA (an initialism for "Completely Automated Public Turing test to tell Computers and Humans Apart", 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 of IBM. 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 Visual Flash System below is a combination of PHP Sessions, JavaScript and Macromedia Flash, it doesn't require any special modules installed on the server and while it's very difficult to break it with OCR it is nearly impossible to break it with a workaround method (flashvars, javascript, sessions) and can't be done with publicly available CAPTCHA breaking tools, requires highly professional customized approach.

   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.

Update: 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 and XSS 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.

Visual Flash CAPTCHA Testing Email Contact Form



   CAPTCHAs are used to prevent bots from using various types of computing services. Applications include preventing bots from taking part in online polls, registering for free email accounts (which may then be used to send spam), and, more recently, preventing bot-generated spam by requiring that the (unrecognized) sender pass a CAPTCHA test before the email message is delivered.

   Other uses include adding comments to blogs, pictures, websites. Or tell-a-friend scripts. Almost anywhere a user would enter information and submit it to the website. CAPTCHAs are by definition fully automated, requiring little human maintenance or intervention in administering the test. This has obvious benefits in cost and reliability.

   Automated attacks on CAPTCHAs are also growing more sophisticated. Some projects have made significant progress in defeating commonly used CAPTCHAs, which has contributed to a general migration towards more sophisticated CAPTCHAs.

   See Breaking CAPTCHA

   Even for perfectly sighted individuals, new generations of CAPTCHAs, designed to overcome sophisticated recognition software, can be very hard or impossible to read. A recent Microsoft research paper - found in 2005 that computers are now better than humans at solving CAPTCHAs based on alphabetic characters

   Any comments are welcome, please visit the forum

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