When you visit a webpage, you might see a CAPTCHA to make sure you’re a real person and not a bot. These usually involve jumbled words, some recognizable images or just a box that says, "I am not a ...

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 ...

From Rorschach tests to trigonometry, this 48-level gauntlet is the most infuriating test of your humanity yet. Can you ...

A core security mechanism that keeps us all safe online is likely to fail within the next few years. This could cause a massive rekeying of websites and big shifts in how we approach online security.

Forget having to type those barely legible letters and numbers. — -- There's now an easier way to prove to Google that you're not a robot. Anyone who has ever spent several attempts trying to ...

There are all kinds of CAPTCHAs out there: unscramble the characters, identify the object, count the cats, classify items, move the slider, and so on. Many of them are rather transparently ...

You are searching for fares and hotels on a discount travel site and you finally find some great deals. Now you need to create an account and buy tickets. But you can’t. Why? CAPTCHA -- the super ...

Computers can do all sorts of amazing things, from searching the Web at an incredible rate to playing chess at a grandmaster level. Yet some tasks that are easy for people to perform remain remarkably ...

UPDATE: Gmail, Yahoo and Hotmail's CAPTCHA broken by spammers. Jeff Yan and Ahmad Salah El Ahmad, at the School of Computing Science, Newcastle University, England recently published a research paper ...