> Various techniques have been tried in the past to circumvent > CAPTCHAs, with the most successful ones using humans. I was surprised to see that the article did not explicitly link to the AI approaches to breaking CAPTCHAs which are listed at the end of http://www.captcha.net/. Some of these papers are quite old and date back to the time when CAPTCHAs first started appearing on the 'net about 5 years ago. It may just be that computers have become faster over the past five years *and* the programs have had time to gather enough data to enable the above approaches to increase their success rate. Kapil. --
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