Proposal for "Text_CAPTCHA"
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Implementation of CAPTCHA (completely automated public Turing test to tell computers and humans apart) images, a concept conceived by Luis von Ahn, Manuel Blum, Nicholas J. Hopper and John Langford. This technique is used on many websites (including eBay, Yahoo! and others) in order to prevent automated form submissions. You probably have seen this effect before: before submitting a form, you are presented an image with some characters on it and you have to enter these characters in a textbox before the form is submitted. The "Image" driver of Text_CAPTCHA creates these images. The text on the CAPTCHA is created using Text_Password. Currently, the obfuscation algorithm in order the make the life of OCR algorithms harder is rather simple. I evaluated Image_Text in order to add the text on the image but will have to wait until the package supports rotation in order to be able to use it. I have also experimented with other effects like color gradients. The good thing is that the algorithm can change without breaking BC. :-) (please note that currently .phps files are not syntax-highlighted on my server; I am working on that) |
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