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Brad Fitzpatrick

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best captcha format EVAR! [Aug. 25th, 2005|05:34 pm]
Brad Fitzpatrick
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I just invented the best CAPTCHA format evar:



Aaaaah yeah.

Pre-clarification: This is pretty much a joke.

Even better:

http://www.picpix.com/brad/pic/008dsdxr

BTW, I hear these don't work well in IE. I'm looking at them in Firefox.
LinkReply

Comments:
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[User Picture]From: colin
2005-08-26 12:36 am (UTC)
pass the pipe, baby, don't bogart.
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[User Picture]From: xotiffany
2005-08-26 12:37 am (UTC)
Epileptics beware!
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[User Picture]From: xotiffany
2005-08-26 12:41 am (UTC)
Ok yea. Killing the eyes.
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From: phil
2005-08-26 12:37 am (UTC)
I think I'm having a seizure.
(Reply) (Thread)
[User Picture]From: solteronita
2005-08-26 12:37 am (UTC)
The mall at Christmas time.
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[User Picture]From: nick
2005-08-26 12:38 am (UTC)
"such a fine line between stupid and clever"
(Reply) (Thread)
[User Picture]From: ydna
2005-08-26 12:39 am (UTC)
Awesome!
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[User Picture]From: funjon
2005-08-26 12:40 am (UTC)
Sweet merciful crap!
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[User Picture]From: j7xz49br3m93xrr
2005-08-26 12:41 am (UTC)
Y'know, that's actually not a bad idea. Not that specific implementation, of course, it's kinda hard to read, but joke or not, animated captchas aren't a bad idea..
(Reply) (Thread)
From: (Anonymous)
2005-08-26 02:40 pm (UTC)
still easily breakable by either testing all frames and using a standard still-captcha algo (actually, it may help an attacker by allowing them to do all frames and then take the most frequent answer) or finding some method of compositing the frames into a single one and then running traditional algorithms on that.

additionally, if the motion is applied in a consistient/uniform manner and/or the perturbation is not, it either adds no additional security, or, in the case of the latter, actually leaks data about edges.

most people never think about breaking captchas when they create them, which is why it's so easy to crack most of them, including LJs.

0 user@host:~/gaffler3$ wc -l gaffle.c
308 gaffle.c
0 user@host:~/gaffler3$

YHBT,
bantown minister of *
(Reply) (Parent) (Thread)
(no subject) - (Anonymous) Expand
[User Picture]From: lisa
2005-08-26 12:42 am (UTC)
pretty much the best captcha ever.

i'd throw in more rainbows.
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[User Picture]From: imgreen
2005-08-26 12:42 am (UTC)
the letters.. they keep changing in front of my eyes...

the second one is actually easier to read
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[User Picture]From: jwz
2005-08-26 12:44 am (UTC)
That's awesome. You should integrate the Apple2 screen saver into that.
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[User Picture]From: starblazr
2005-08-26 05:43 am (UTC)
or phosphor... or AnalogTV
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[User Picture]From: smackfu
2005-08-26 12:48 am (UTC)
It's a schooner.
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[User Picture]From: brad
2005-08-26 01:05 am (UTC)
A schooner is a sailboat! :P
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[User Picture]From: killhamster
2005-08-26 01:02 am (UTC)
put some tinfoil on your antenna, that should clear right up.
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[User Picture]From: xotiffany
2005-08-26 01:08 am (UTC)
haha!
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[User Picture]From: adcott
2005-08-26 01:10 am (UTC)
could that leave machine-readable text if you squish it into a static image taking the average darkness for each pixel?
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[User Picture]From: brad
2005-08-26 04:19 am (UTC)
Yeah, totally. Which is why I later went on to make moving text. :-)
(Reply) (Parent) (Thread)
[User Picture]From: jc
2005-08-26 01:25 am (UTC)
Yeah, it's a joke, but now my retinas have officially been incinerated, I can put more thought into the underlying idea.

Thinking about it, animated captchas are nice and flashy but generally impractical. It's not hard to pull a single frame from the above example and analyse it on its own, and if you were to break up the sequence or even the letters themselves between frames you'd end up with horribly blinky text that'd leave epileptics paralysed anyway.

It's even harder to generate a captcha that bots can't automatically present to a human in exchange for free pr0n...
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