...continuing masturbatory tech talk.... What kind of audio captchas have people tried? I would think that asking people to identify a piece of music would be a pretty good captcha, although could be difficult to not make it Eurocentric. For instance, if you had a bunch of songs as universally recognisable as, say happy birthday, and then had a bunch of different recordings of those, it would be extraordinarily difficult for a computer to recognise the piece, since it could be in any key, in any tuning, with slight rhythmic diffences, but would still be recognisable to anyone who knew the piece. Yes, you would have to figure out what pieces to use and get the recordings, but it would still be cool. Of course, Carnildo/Mark's workaround would still be there. Makemi
On 3/20/06, Mark Wagner carnildo@gmail.com wrote:
On 3/20/06, Neil Harris neil@tonal.clara.co.uk wrote:
I tried to think of a good text-only captcha scheme some time ago, but came up short.
The ideal text captcha is:
- endlessly variable (there must be at least millions of potential
challenges, to defend against replay attacks)
- easy for people to answer without any specialist knowledge
- easy to answer for people without advanced skills in the target
language
- not generated by a simple algorithm which can be reverse-engineered
(as with the above)
- not Googlable
- easy to assess the answer using a computer program (which typically
means it's a simple word or phrase)
Even this isn't good enough. Spammers have already figured out out how to defeat every visual captcha out there, and there's no reason to believe it won't also apply to audio and text captchas. It's very simple:
- Advertise free porn on USENET and other locations.
- In order to get the pictures, users need to answer a captcha.
Serve up the captcha for a site you're trying to register for. 3) User answers the captcha. User gets the porn, spammer gets the new account, everyone's happy.
-- Mark [[User:Carnildo]] _______________________________________________ WikiEN-l mailing list WikiEN-l@Wikipedia.org To unsubscribe from this mailing list, visit: http://mail.wikipedia.org/mailman/listinfo/wikien-l