Re: confirming it's a person

["David Molnar" <dmolnar () gmail com>]

On Tue, Mar 25, 2008 at 9:31 PM, Agutin Gianni <agustingianni () gmail com>
wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> I think we have already discussed this topic, and someone said we could
> use pictures of cats and other animals and ask the user to count the
> number of cats on the photos.
>
> Microsoft is working on this, it looks promising.
>
> http://research.microsoft.com/asirra/

As cool as ASIRRA is, and as awesome as it is that they help find homes for
pets, it is more or less "a better CAPTCHA." I took the original post as a
request for a manual for bot-detection techniques in addition to CAPTCHAs. I
don't know of anything in one place on this topic, although I can think of
things like Bayesian filters for the spam application as maybe a place to
start.

Incidentally, this paper just showed up on eprint.iacr.org . The author
claims an automatic classifier between cats and dogs that can pass a
12-image ASIRRA challenge 10.3% of the time:

Machine Learning Attacks Against the ASIRRA CAPTCHA
Philippe Golle
http://eprint.iacr.org/2008/126

-David Molnar

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