[cryptography] CAPTCHA as a Security System?

Jonathan Thornburg jthorn at astro.indiana.edu
Mon Jan 2 22:35:38 EST 2012


On Mon, 3 Jan 2012, John Levine wrote:
> Scalping can be very profitable, with markups of $100 per ticket not
> unsusual, so if I were a scalper, I'd have a network of web proxies,
> to make it hard to tell that they're all me, a farm of human CAPTCHA
> breakers in Asia who cost maybe 5c per CAPTCHA, [[...]]

According to
  http://www.nytimes.com/2010/04/26/technology/26captcha.html?hpw
the going rate for paying humans to break CAPTCHAs is around $1 per
1000 CAPTCHAS, i.e., around 0.1 cent per CAPTCHA.

-- 
-- "Jonathan Thornburg [remove -animal to reply]" <jthorn at astro.indiana-zebra.edu>
   Dept of Astronomy & IUCSS, Indiana University, Bloomington, Indiana, USA
   "Washing one's hands of the conflict between the powerful and the
    powerless means to side with the powerful, not to be neutral."
                                      -- quote by Freire / poster by Oxfam



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