It's been a quarter of a century since the invention of the CAPTCHA. The great gatekeeper of the internet was originally created by students at Carnegie Mellon University to prevent bots from rigging ...

Quite simply, CAPTCHA works by asking end users to perform some task that a software bot cannot do. If the user can do the task correctly, it provides authentication to the service that the user is a ...

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 ...