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Re: Captcha identify

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Date Thu, 14 Aug 2014 05:43:53 +1000
Subject Re: Captcha identify
From Chris Angelico <rosuav@gmail.com>
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On Thu, Aug 14, 2014 at 5:24 AM, Chris Kaynor <ckaynor@zindagigames.com> wrote:
> On Wed, Aug 13, 2014 at 4:39 AM, Eric S. Johansson <esj@harvee.org> wrote:
>>
>> eliminate captchas, 35+million disabled people would thank you as would
>> many more millions of the not-yet-disabled like your future self.
>
>
> And so would the spammers, which is who captchas are trying to block.

There are alternatives that are both easier for legit people and
harder for spambots. Some rely on the fact that humans read things two
dimensionally, and scripts look at the underlying structure; so, for
instance, random field names and cunning CSS to match them up with
their labels can result in a form that's completely messed up in the
source, but looks perfect to a user. Or you can put extra fields down
that you can't see if the form's laid out properly. Or you can combine
those sorts of tricks with a very simple challenge-response, like
"What is one plus one?" that requires some specific value to be in a
specific field - and if that value occurs in the wrong field, you
throw the form back to the user.

For some reason, everyone's jumped on the "show some mangled
text/numbers and ask the user to enter them" bandwagon, in the same
way that everyone has gone for passwords that require
lower/upper/digit/symbol and (in the most annoying cases) are actually
length-limited to something stupid like 12 characters. Yes, maximum,
not minimum. Grumble.

ChrisA

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Thread

Captcha identify Wesley <nispray@gmail.com> - 2014-08-12 00:04 -0700
  Re: Captcha identify Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-08-12 08:59 -0400
    Re: Captcha identify Wesley <nispray@gmail.com> - 2014-08-12 07:57 -0700
      Re: Captcha identify Chris Angelico <rosuav@gmail.com> - 2014-08-13 01:06 +1000
        Re: Captcha identify Denis McMahon <denismfmcmahon@gmail.com> - 2014-08-12 15:38 +0000
          Re: Captcha identify Chris Angelico <rosuav@gmail.com> - 2014-08-13 01:54 +1000
            Re: Captcha identify Wesley <nispray@gmail.com> - 2014-08-12 18:36 -0700
              Re: Captcha identify Chris Angelico <rosuav@gmail.com> - 2014-08-13 11:46 +1000
              Re: Captcha identify Ben Finney <ben+python@benfinney.id.au> - 2014-08-13 11:54 +1000
              Re: Captcha identify Rob Gaddi <rgaddi@technologyhighland.invalid> - 2014-08-13 09:28 -0700
                Re: Captcha identify Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-14 03:52 +1000
                Re: Captcha identify Chris Angelico <rosuav@gmail.com> - 2014-08-14 04:21 +1000
              Re: Captcha identify "Eric S. Johansson" <esj@harvee.org> - 2014-08-13 07:39 -0400
                Re: Captcha identify alister <alister.nospam.ware@ntlworld.com> - 2014-08-14 11:42 +0000
                Re: Captcha identify Denis McMahon <denismfmcmahon@gmail.com> - 2014-08-14 23:19 +0000
                Re: Captcha identify "Eric S. Johansson" <esj@harvee.org> - 2014-08-15 13:18 -0400
                Re: Captcha identify Chris Angelico <rosuav@gmail.com> - 2014-08-16 03:30 +1000
              Re: Captcha identify Chris Angelico <rosuav@gmail.com> - 2014-08-14 05:27 +1000
              Re: Captcha identify Chris Kaynor <ckaynor@zindagigames.com> - 2014-08-13 12:24 -0700
              Re: Captcha identify Chris Angelico <rosuav@gmail.com> - 2014-08-14 05:43 +1000
              Re: Captcha identify Joel Goldstick <joel.goldstick@gmail.com> - 2014-08-13 15:44 -0400
              Re: Captcha identify Skip Montanaro <skip@pobox.com> - 2014-08-13 14:55 -0500
              Re: Captcha identify Tim Chase <python.list@tim.thechases.com> - 2014-08-13 15:01 -0500
              Re: Captcha identify Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-13 14:16 -0600
                Re: Captcha identify Peter Pearson <ppearson@nowhere.invalid> - 2014-08-14 18:37 +0000
                Re: Captcha identify Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-14 13:42 -0600
                Re: Captcha identify "Eric S. Johansson" <esj@harvee.org> - 2014-08-14 15:43 -0400
                Re: Captcha identify alex23 <wuwei23@gmail.com> - 2014-08-15 17:03 +1000
                Re: Captcha identify Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-15 09:14 +0100
                Re: Captcha identify Chris Angelico <rosuav@gmail.com> - 2014-08-15 08:22 +1000
              Re: Captcha identify "Eric S. Johansson" <esj@harvee.org> - 2014-08-13 16:42 -0400
              Re: Captcha identify Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-13 14:18 -0600
              Re: Captcha identify Chris Angelico <rosuav@gmail.com> - 2014-08-14 09:13 +1000
              Re: Captcha identify Denis McMahon <denismfmcmahon@gmail.com> - 2014-08-14 23:15 +0000
                Re: Captcha identify Ben Finney <ben+python@benfinney.id.au> - 2014-08-15 13:23 +1000
              Re: Captcha identify Michael Torrie <torriem@gmail.com> - 2014-08-15 09:20 -0600
  Re: Captcha identify Denis McMahon <denismfmcmahon@gmail.com> - 2014-08-12 13:51 +0000

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