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Old 21st June 2006
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J7N J7N is offline
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you may have less job if you add this letter-typing thing to the registration process. So if you ask programs to enter some letters inside bitmaps, they will not succeed and the number of "spamming programs" will decrease.
There is already a prompt for confirmation code: six alphanumeric characters overlayed with noise. I have seen very hard-to-read text being OCR'd. Most likely this type of captcha code has also been defeated.
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