Re: defeating voice captchas

[Valdis.Kletnieks () vt edu]

On Tue, 14 Feb 2006 00:51:31 +0200, Gadi Evron said:

> Even if it was all set in one audio file, and even if the audio was 
> played with to be, as an example, in a higher pitch. Or perhaps even if 
> several different voices would greet us…
> Looking at general similarities in the audio file itself would be enough 
> to break down this Captcha once enough harvesting attempts (not that 
> many really) were saved.

Given that voice recognition can currently do up to 160 words/minute continuous
speech over a 50K word vocabulary at up to 99% accuracy, on commodity hardware,
I would think that recognizing 36 letters/numbers would be a no-brainer.

http://www.nuance.com/naturallyspeaking/

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