We've all been there: You click on a website and are immediately directed to respond to a series of puzzles requiring you to identify images of buses, bicycles and traffic lights before you can go any ...
CAPTCHAs are those now ubiquitous challenges you encounter to prove that you’re a human and not a bot when you go to log in to many websites. As a computer scientist, I see CAPTCHAs as an effective ...
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