Hi All:
 
I've been trying out an audio CAPTCHA from Google.  It is the most difficult
such CAPTCHA that I've encountered.  In fact it is almost impossible to use.
It has too many words and the background noise seems to be too loud relative
to the actual words being spoken.  
 
My questions:
 
First, can anyone recommend alternative audio CAPTCHA schemes that are
usable yet meet the intended security purposes?
 
Second, can anyone recommend alternative schemes that provide security and
privacy  with minimal human intervention as CAPTCHA does?
 
Thanks for any information!
 
Stan


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