Reply to post: Why not try ...

Google, Facebook's CAPTCHAs vanquished by security researchers

Herby

Why not try ...

Exponential rate limiting. Start over at a random time of the day. If the user input is supposed to be typed, measure the time it takes for a reasonable typist to enter the comment (or whatever). Go from there. Display a clock if you must allow for cutting and pasting, but double up on the time out period.

Yes, they are a pain. I doubt that the google people can solve all of them accurately.

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