Cheat Engine

[Deltron Z]

Edit: I solved my problem.

Hey everybody.

I've been trying to do this for a while now, but I can't seem to figure out how to download the CAPTCHA image from the registeration page.
I took a random page from google and come up with ("complete random" - first result ) this forum's registeration page:
http://sanbarrow.com/phpBB2/profile.php?mode=register&agreed=true&coppa=true

What I've done (in C#) is connect to this web page first, once I've had my cookie set and generated a session ID for my CAPTCHA, I took the URL of the CAPTCHA and tried to download this image (using the cookie I've got), but it doesn't seem to work, it returns a stream with no seek operations and length 0 (actually throwing an exception and ReadToEnd() returns empty string).
The same happens when trying to access the CAPTCHA image with a different cookie.
I've also noticed that everytime I access the CAPTCHA it generates a (actually 2) new cookie(s) for me with data from the PHPBB system.

I also tried changing my User-Agent and simulating a web browser, but I can't seem to download the image properly.

I'm not an expert when it comes to web protocols, so I'd be glad if anyone could help.

[elpacco]

You're not supposed to be able to be able to have any access to a captcha image except to be able to view it with your own eyes. I mean, the entire purpose of captcha is to require a person to solve it and prevent anything automated to get by. Considering its extremely popular usage, I'd think they do that job very well. While I don't know much about bypassing captcha, common sense tells me that you're not the first to try, and that it's likely very difficult if feasible at all.

[Deltron Z]

Well, I know what is their purpose, I just find PHPBB's CAPTCHAs relatively easy and I'd like to add them to my database. I've already got most of the code for basic actions like custom user-input rules to search for the CAPTCHA on web pages, custom image processing and recognition. (however, this is still just the very early basic skeleton of a beta version of a future potentioal project)
I've managed to get 100% recognition on some basic CAPTCHAs, and now I'd like to expand my database, but when I occured PHPBB systems I wasn't able to deviese rules for my program to search for the CAPTCHA. I couldn't even manage to get to download the image by writing the headers into the code manually, even though later I'd like to try something a little more dynamic...
Downloading the CAPTCHA isn't supposed to be even hard, but PHPBB has some defence mechanism.

By the way, I've managed to devise algorithms to read some (very basic and old) reCAPTCHAs (the two shown in Wikipedia), however my program doesn't support such advance custom rules so it can't read it, but I can write a seperate program to specifically read these two reCAPTCHAs, with inverted colors and noise.

Now, don't mind what I am going to do with the image after I download it, just thought I could use some help figuring out how to simulate a web browser to trick the system into letting me access the generated CAPTCHAs.


Edit: problem solved, appearntly it was nothing I thought it could be, and like every weird bug the solution is naive and simple - it was simply a typo in the regular expression. at least now I support the change of cookies.