Porn Rewards Users To Get Past Anti-Spam Captchas 420
Stalke writes "Spammers are now usings a new technique to circumvent the 'captchas,' the distorted text in graphics, that users must input to receive the free email account. The spammers have cracked the system by displaying the 'captchas' on free porn sites in real time. Since there are always a large number of people signing up for free porn, they do the work of decripting the 'captchas' which is then replayed back into the spammers program to create a new email account. Who thought that porn could be a hacking technique!" Sure sounds plausible, though the link here says only "someone told me."
Re:One thing leads to another (Score:5, Informative)
It's pretty lame, and I guess most ad-agencies frown upon it as the clickers aren't really producing any business..
Technology Review (Score:2, Informative)
Re:Easily countered (Score:5, Informative)
Automated spam script goes to sign up new email address, gets presented captcha. Downloads captcha -- as the server would expect any normal web browser to do.
Captcha is copied to some location. Filename probably contains information that can identify the specific script that's running, since there'll undoubtedly be many going simultaneously.
From that point, there's about 20 minutes, give or take, for the porn site to display the copy of the captcha and ask for the user's input. On a site seeing any amount of traffic at all, that should be more than enough.
Once a user has given input, the spam script is notified, and sends the input back to the captcha server. The captcha server never sees the IP address of the human -- it only deals with the spam script -- so it'll never know anything's up.
Re:Sounds like rubbish (Score:5, Informative)
Re:Sounds like rubbish (Score:2, Informative)
OCR may or may not be good enough. However, the whole purpose of the graphics is that the text is obfuscated in such a way that it makes it difficult for OCR but still easy for humans. The article says that which a computer can generate, a computer can often solve. Sometimes perhaps, but certainly not always. For a trivial example, take a photograph and change every pixel in it to black. A computer can do it but another computer can obviously not undo it, as all of the original information is lost. When you blur or otherwise obfuscate text, you're destroying information. The remaining information may be sufficient for a human to understand it, but insufficient for an OCR algorithm. I haven't seen anything reliable which evaluates OCR on captchas, but I know how well OCR does on regular scanned text. It's much better than it used to be but still far from exact.
John Dvorak suggestion (Score:1, Informative)
Re:Sounds like rubbish (Score:4, Informative)
Porn site gets a visitor.
The cgi or other executable on the web server's site then starts to sign up for an email account, and caches the graphic that must be decoded.
The exact same graphic is presented to the porn site visitor.
The porn visitor decodes the graphic and clicks "Submit"
The program at the porn site then finishes signing up for an email account by entering the text that the porn visitor entered.
If the email address is successfully created, the program then permits the user into the restricted area, otherwise entrance is denied and the whole process repeated.
Yes, these images are generated on a per session basis, but the whole point is that each visitor to a porn site gives the porn sites a new potential email address with which to spam.
It's actually quite ingenious if you ask me.
Re:Computer Program (Score:5, Informative)
I wish I'd thought of it first, I could've patented it. Or maybe someone should, so the spammers can't use it.
Old news and incorrect data (Score:5, Informative)
Re:I am not looking at porn (Score:3, Informative)
Now, the case of <code> elements is different. Although it doesn't say so in the HTML spec, most browsers handle them with white space being preserved.