On Saturday 20 January 2007 12:50, Stefan Seifert wrote: > Ampere K. Hardraade wrote: > > Ah yes, here it is: > > http://www.flightgear.org/forums/profile.php?mode=register&agreed=true > > > > The problem is, captcha could be get around very easily by professional > > spammers. > > And this particular captcha is really useless. I just played around a > little with gimp and used only a gaussian blur, the color level tool and > some cut and paste to make the characters perfectly readable by GNU OCR: > http://organiceit.lanscene.at/~nine/captcha-enhanced.png > > And gocr cought it right on the first try. To automate this is would be > trivial, no magic involved. > > IIRC Wikipedia links to a good site, trying to do this. Good captchas > that are harder to crack would use different colors and twist and > distort the letters. Unfortunately the captchas that are hard to > automate are also becoming increasingly hard for humans to get right...
I have seen ideas around where an image of a 'thing' is shown, and the user has to type in it's name; thus a picture of a cat, dog, car, house etc. The algorithm for a computer to do that is nigh on impossible, but a human can compute the image instantly. How doable it is for a forum registration, I don't know. Nick ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
