On Captchas, and a nifty slide for those who can read Braille visually

[pne]

There's a slide show called Accessibility Problems with Visual Verification Systems talking about visual verification systems such as captchas (those images of distorted text that are supposed to prove you're human) and problems with them.

Many slides have images of typical captchas (e.g. those provided by LiveJournal, PayPal, Passport, ...); one particular slide had a "type the text of this image into this box" which probably not many people could comply with :) (to illustrate the point, I suppose).

I'll tag fledchen, leora, and pthalogreen as probably being able to.

Comments

[codeman38.livejournal.com]

kynn used the Braille captcha on his (now apparently defunct) Maccessibility blog precisely to make a point of how inaccessible captchas are. Of course, it was quite easy to decode— on the original blog, the ALT attribute of the Braille image was "Kynn was here"!

[pne.livejournal.com]

Ah, so that's where the author of the presentation got it from. (The captcha does say "Kynn was here" and I was wondering who Kynn was.)