Conrad Irwin wrote:
Just as with
image captchas, you'd need to introduce noise into it.
If you are working from known constituents, you can use
cross-correlation to ignore noise pretty effectively (I believe it's
what humans do). The choice then is either to make the noise sound
like the captcha's numbers (google's approach), which is very hard to
solve (at least I find it so), or to use ReCAPTCHAs
Funny. It turns out that now Recaptcha belong to Google.
vast database of
unknown sound files (with noise added to obscure the phonemes). The
human brain is capable of filling in completely obscured phonemes in
order to make the sentence "make sense"
I wonder if we could abuse Wikimania presentations audio asking to write
each word from it.
(assuming they speak the
language in question - another usability problem with these),
Certainly. That's
a very big drawback on adding audio captchas to WMF
prjects.
It's likely to be much easier to improve the
"request an account from
a human" process - which has inbuilt rate-limiting, a little bit of
turing test, and a nice splash of common sense that is so hard to
instill in an automated system.
That would be removing the "Completely Automated" part :)
It's not a bad idea, but what should we ask them? A too open textarea
leads to "Plz make an account" reasons which have very little Turing
entropy. "Please summarise the Main Page featured article so we know
that you have a decent brain" would be more secure, but our users
wouldn't be too happy with that.
I have been
trying flite, and didn't find the synthesized text too
understable by itself. :(
In which case a computer could probably solve them better than you :).
Surely. I suspect that would be quite easy to crack by comparing with
each phonema. :)