[nabs-l] FW: a new type of captcha

[T. Joseph Carter]

We've had a nice discussion about how people assume that hard for 
humans is hard for computers, and that it isn't generally so.  We 
talked about how the current audio CAPTCHAs are often harder to use 
for some of us than getting someone to read the printed ones.

The creator doesn't really understand the algorithmic aspects of 
audio manipulation.  I explained what PCM samples are (16 bit signed 
numbers representing sound waveform amplitude over time for the nerds 
on the list) and that mixing two sounds was just a matter of adding 
them together and clipping the waveform if necessary.  (You don't 
want it to be since that distorts sound.)

So the developer is open to coming up with an equivalent we can use, 
but doesn't really know how to do it.  In the meantime, given the 
choice between having us unable to use the site and having the site 
clogged with spam, however, we lose.

Joseph


On Wed, Apr 15, 2009 at 06:14:30PM -0400, Liz Bottner wrote:
>Cool. Thanks for posting your findings. I, for one, definitely appreciate
>it. I would be interested to know if they follow up on your response. 
>
>Liz 
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