Falkkin
writes “Ars Technica reports that audio CAPTCHAs consisting of only
distorted digits or letters can be easy to crack using machine learning
techniques. This includes most of the audio CAPTCHAs currently in use
on the Web. The reCAPTCHA team has discussed their new audio CAPTCHA,
which is resistant to this attack.”

Read more of this story at Slashdot.

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