In the Human Identifiable code that i have for authentication on my site, I have obsfucated images A-Z & 0-9 with each character a seperate image that is not OCR. The idea is that a person reads the code, and the server parses it. Currently i have the perl program copy a random string of images that have these characters on it into a folder with the same name as the authenticating user's session id. The images are renamed when copied to denote their order (not what the represent).

It works, but i would rather generate obsfucated images on on the fly since I am using the same 36 images which can be cached & saved by an individual, who can note which image correlates to which character and then make a program to run comparisons on the images pixels to bypass the human readable code.

Anyone know how to do this? I saw an attempt on an old png image generation (in cpan i belive) but it looked like it was possible to OCR it from what i saw. Ty in advance.

Here is a refence to what i am talking about (when you sign up for yahoo mail): http://xrl.us/c69p (Link to edit.yahoo.com)

BTW: I am using a Win32 based system (not by choice) with activestate perl.

avitar.net

edit (broquaint): shortened 'page-widening' URL + linkified it

In reply to How do you make on the fly images? by Avitar

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