- From: John Foliot <jfoliot@stanford.edu>
- Date: Wed, 17 Mar 2010 13:58:52 -0700 (PDT)
- To: "'Silvia Pfeiffer'" <silviapfeiffer1@gmail.com>, "'Gregory J. Rosmaita'" <oedipus@hicom.net>
- Cc: <public-html-a11y@w3.org>
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
Received on Wednesday, 17 March 2010 20:59:26 UTC