5 ms·

I tried making an animated gif CAPTCHA a few years back, relying on persistence of vision (to try and get round the whole screenshot and process botting issue):

by palmr 13y ago

I tried making an animated gif CAPTCHA a few years back, relying on persistence of vision (to try and get round the whole screenshot and process botting issue): http://sandbox.palmnet.me.uk/gifcaptcha/index.php http://sandbox.palmnet.me.uk/gifcaptcha/index.php Ended up with roughly 75% correct human responses and 40% correct using a bot. Which are pretty poor stats for both sides of the equation.

cmircea 13y ago
Eeew.
professorTuring 13y ago
This looks like a much better idea. I would continue working in this. I have some feedback to make it harder for robots and easier for humans. Consider this as some quick ideas that should be elaborated (and they may be wrong): - Move the letters in opposite direction to the windows and maybe rotate them or make them move inside the canvas. - Make the windows appear in randomize locations but move them faster. - Make the blacked part change colors. I think this is a very, very good way to make a turing test. Congratulations.
- palmr 13y ago
  Cheers for the feedback. I gave up on it quite a while ago but I could revisit it some time and try out some of your ideas. The main issue was that some browsers render the frames so slowly it was almost impossible. Also, while making it slightly harder to crack with a bot it can be done by merging the frames together and tracking the lightest parts to find the letters which can then be put through OCR. Also, while making it harder for bots to crack it also makes it significantly harder for people to read, especially people without 20/20 vision which is a major problem.
damoncali 13y ago
Keep working on this. It's a little irritating to look at, but I bet with some more effort, you can make it pretty nice.
- mtrimpe 13y ago
  Definitely. You should also consider tracking which letters have low recognition rates, since I guess it's mostly problems with things like Q vs O and Z vs 2.

by palmr 13y ago

cmircea 13y ago

Eeew.

professorTuring 13y ago

This looks like a much better idea. I would continue working in this. I have some feedback to make it harder for robots and easier for humans. Consider this as some quick ideas that should be elaborated (and they may be wrong): - Move the letters in opposite direction to the windows and maybe rotate them or make them move inside the canvas. - Make the windows appear in randomize locations but move them faster. - Make the blacked part change colors. I think this is a very, very good way to make a turing test. Congratulations.

palmr 13y ago
Cheers for the feedback. I gave up on it quite a while ago but I could revisit it some time and try out some of your ideas. The main issue was that some browsers render the frames so slowly it was almost impossible. Also, while making it slightly harder to crack with a bot it can be done by merging the frames together and tracking the lightest parts to find the letters which can then be put through OCR. Also, while making it harder for bots to crack it also makes it significantly harder for people to read, especially people without 20/20 vision which is a major problem.

damoncali 13y ago

Keep working on this. It's a little irritating to look at, but I bet with some more effort, you can make it pretty nice.

mtrimpe 13y ago
Definitely. You should also consider tracking which letters have low recognition rates, since I guess it's mostly problems with things like Q vs O and Z vs 2.