5 ms·

It actually makes it a lot easier for humans, while not making it immediately easier for bots which will need to be tuned to use motion. Pretty smart.

codeka 13y ago
Sure, but it wouldn't take a lot of tuning to update a bot to read the animated frames and then you're back to square one. In fact, with 20-odd frames and only three (entirely upper-case!) letters to select it looks very easy to develop a bot that would get a very high success rate.
- joelthelion 13y ago
  Actually benefiting from the motion requires a new algorithm. Probably not that hard to design, but not trivial either. As always CAPTCHA is a game of cat and mouse. When something is completely broken, you need to think up something new.
  - deleted 13y ago
    [deleted]
  - calinet6 13y ago
    Are the people using the captcha-breaking algorithms the ones developing them? Probably not. These things take time... the best way to combat them is probably to change what your captcha looks like and works like every week or so.
  - leddt 13y ago
    You don't actually need to use the motion to improve the success rate. Just run the normal algorithm on each frame and elect a winning solution.
lachenmayer 13y ago
They don't really have to be tuned for motion, you can just consider each frame individually.
- joelthelion 13y ago
  In that case you don't gain anything from the motion (except maybe the ability to vote between your bot's output for the individual frames, but that also makes your bot 20 times slower).
- Retric 13y ago
  With this implementation you don't, but it's not hard to construct it such that there is no single frame with enough information to construct the whole message. If you screen capture there are several frames where you really can't tell what the middle letter is, but it's obvious what the message is. The real issue is a computer can compare the images individually and combine them so if it get's 'G_G', 'GF_', and '_FG' it's going to assume 'GFG'.
roq 13y ago
Actually makes it a lot easier for BOTs. This one is very easy to break.
jiggy2011 13y ago
Don't people from nigeria offer captcha breaking services for something like $1/thousand now?
alcuadrado 13y ago
motion? just take a single frame and OCR it!

codeka 13y ago

Sure, but it wouldn't take a lot of tuning to update a bot to read the animated frames and then you're back to square one. In fact, with 20-odd frames and only three (entirely upper-case!) letters to select it looks very easy to develop a bot that would get a very high success rate.

joelthelion 13y ago
Actually benefiting from the motion requires a new algorithm. Probably not that hard to design, but not trivial either. As always CAPTCHA is a game of cat and mouse. When something is completely broken, you need to think up something new.
- deleted 13y ago
  [deleted]
- calinet6 13y ago
  Are the people using the captcha-breaking algorithms the ones developing them? Probably not. These things take time... the best way to combat them is probably to change what your captcha looks like and works like every week or so.
- leddt 13y ago
  You don't actually need to use the motion to improve the success rate. Just run the normal algorithm on each frame and elect a winning solution.

lachenmayer 13y ago

They don't really have to be tuned for motion, you can just consider each frame individually.

joelthelion 13y ago
In that case you don't gain anything from the motion (except maybe the ability to vote between your bot's output for the individual frames, but that also makes your bot 20 times slower).
Retric 13y ago
With this implementation you don't, but it's not hard to construct it such that there is no single frame with enough information to construct the whole message. If you screen capture there are several frames where you really can't tell what the middle letter is, but it's obvious what the message is. The real issue is a computer can compare the images individually and combine them so if it get's 'G_G', 'GF_', and '_FG' it's going to assume 'GFG'.

roq 13y ago

Actually makes it a lot easier for BOTs. This one is very easy to break.

jiggy2011 13y ago

Don't people from nigeria offer captcha breaking services for something like $1/thousand now?

alcuadrado 13y ago

motion? just take a single frame and OCR it!