[nycphp-talk] easily defeating captchas using automated imageanalysis
Allen Shaw
ashaw at iifwp.org
Tue Nov 2 17:10:28 EST 2004
> John wrote:
> The point of a captcha was to get past that observation (if a system
> built it, a system can beat it). The Captcha was to be a turing
test.. > something that only a human could solve.
> ...
> this is simply not a turing test. What wouldit take to build a
> massive Internet database of cursive words, collected continuously and
> used for captchas? Universal pen input, probably. until then, what do
> we have?
I've seen (or seen theorized) captchas that require a user to enter a
keyword based on three or more different pictures -- for example, show
the user a Frosted Flakes box cover, that famous Nike-branded golfer,
and a Cincinatti Bengals logo, and most users (depending on the target
audience) could get in by typing "tiger". One idea was also to say
"three out of these 4 pictures" and then throw in a bogus picture of
Bambi or the Eifel Tower. I'm sure somebody could program linguistic and
cultural knowledge like this, but that seems a lot more "human" than
what these guys are able to do. ... Um, right?
- Allen
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