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 ...

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

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 ...

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 ...

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 ...

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 ...

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 ...