Comment on How not to design a CAPTCHAparentComments−a3_nm15yIf you only have a limited collection of images to pick from, then bots could get decent scores by picking at random. A better approach might be to ask users to pick matching images (ie. 2^N possible choices).
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If you only have a limited collection of images to pick from, then bots could get decent scores by picking at random. A better approach might be to ask users to pick matching images (ie. 2^N possible choices).