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 ...

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 ...

CAPTCHA programs that are used to determine whether a site visitor is a person or a bot come in pretty standard formats. Think text distortion (where users type the characters they see in a box amid ...

CAPTCHA systems, which are designed to differentiate between human users and automated programmes, have become a pivotal component in securing digital services. Over recent years, the evolution of ...