W3C home > Mailing lists > Public > public-html-a11y@w3.org > March 2010

Re: keep CAPTCHA out of HTML5

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Thu, 18 Mar 2010 08:06:20 +1100
Message-ID: <2c0e02831003171406v1430ed5fu26e9158ed841f3ea@mail.gmail.com>
To: John Foliot <jfoliot@stanford.edu>
Cc: "Gregory J. Rosmaita" <oedipus@hicom.net>, public-html-a11y@w3.org
On Thu, Mar 18, 2010 at 7:58 AM, John Foliot <jfoliot@stanford.edu> wrote:
> Silvia Pfeiffer
>> Is there no way at all to transfer a CAPTCHA onto a braille device?
>> Just curious.
> Hi Silvia,
> No, as it then would also be accessible to bots, etc.  The whole point is
> that CAPTCHAs (visual or audio) are actually testing for physical ability
> rather than cognition - you can see something or hear something, actions
> that machines can replicate but not accurately process - thus, the logic
> goes, you are human and not machine.
> But if a disabled user requires a machine to interact with technology
> (i.e. Adaptive Technology), then the very task that CAPTCHAs have been
> created to do (frustrate machine processing) impacts the user *reliant* on
> machine processing. (And we won't get into the whole issue of some
> people's belief in OCR to save the world, or speech-to-text for
> captioning, because if these technologies did actually work with 100%
> accuracy, they would completely negate the 'security' around CAPTCHAs)
> There is no such thing, nor will there ever be, a totally accessible
> CAPTCHA, as by definition the two are mutually exclusive.
> Cheers!
> JF

Very interesting indeed. It seems to indeed be a big accessibility challenge.

Do images get transferred onto braille at all? Could it be done
pixel-wise? I'm wondering if there could be a technical solution, even
if it doesn't exist yet.

Received on Wednesday, 17 March 2010 21:07:12 UTC

This archive was generated by hypermail 2.3.1 : Wednesday, 7 January 2015 15:05:09 UTC