So you're asking about people who have both audio and vision impairment?
It's a bit tougher case which would probably best be handled by a third
party out-of-band authentication service like
http://www.authentify.com/. If you can't see images or hear audio,
anything else you do in the browser is going to get cracked.
CB
On 11/9/11 2:14 PM, Red.Falcon wrote:
Hi Chris!
But of course quite a few people have a hearing impairment!
And have said the audio capture is bad for them!
What the solution for security is to get around this is going to be difficult!
Colin
On 9 Nov 2011, at 19:01, Chris Blouch wrote:
My usual rules of thumb for CAPTCHA which work at Internet scale are:
1. Algorithmically generated puzzles which are hard for algorithms to solve
(one-way transforms)
Likewise, puzzles which are reasonably possible for real people to solve
2. Puzzles which do not require localization
3. Puzzles which are not susceptible to brute force attacks (high random
success rates)
That said, it should be obvious that swirled character image captchas will not
work for those with vision impairments but this is easily remedied with an
audio version. Audio and image recognition are pretty much the two areas that
algorithms have trouble with. Common solution is multiple people speaking on
top of each other. Hard for algorithms to crack but not impossible for real
people. Playback using Sound Manager 2
http://www.schillmania.com/projects/soundmanager2/
does the heavy lifting to select native html5 or flash for the audio and do it
in a way that works for all browsers. Other than that they just have to make
sure that the audio play button is easily found in the tab order and, once
pressed, moves focus to the text input. Not much else needed beyond that.
CB
On 11/8/11 6:57 PM, Karen Lewellen wrote:
Hi folks,
For reasons that are complicated to explain I have the ear of the legal
department at paypal -ebay. Part of the reason is that, as some of you may
know, they are *requiring* all users to agree that that they read pdf files, or
they will lose their account. Because of this and some other access issues
with paypal and ebay, i have been asked to document why things like pdf and
captcha are issues for those using adaptive tools. I have told them already
that to assume everyone is using jaws is impractical, and that still browsers
like lynx, with its recent edition dated June 2011, are good foundations for
access. I have shared that pdf reaains a hurtle, and captcha is flat out an
issue, as is stuff like flash.
because they are serious though I want to make maximum use of this opportunity.
What I would welcome is article information, places that discuss why pdf for
example and captcha remain barriers. Likewise posts from you if you have met
with issues with either service would be welcome. I want them to fix this for
everyone, not just sweep me under the corporate rug. That they are shifting
all document responsibility t the end user is disturbing, since if you have an
issue say with security, you will bare the blame for any discrepancies in
documentation.
Additionally, if part of your professional life is access, share under your
professional umbrella. If I get enough research responses, i will construct a
solid document for them, and include as many other people as I can.
Thanks in advance,
Karen
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