Captchas are these little word-puzzles in images that web-sites use to keep spammers and bots out. They are everywhere and even the New York Times had an article about Captchas recently. It turns out it’s a nice exercise in applying some machine learning to break these things (with lots of image manipulation to clean up the images). Since spam-bots are becoming smarter, people are switching to new kinds of Captchas. My favorites (using images) so far are Kittenauth and a 3D-rendered word-captcha.
Interesting Experimental Captchas
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