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 survive the world's weirdest CAPTCHA?

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.

For years, Google has used the simple system of distorted text CAPTCHAs to determine whether users were humans or robots. Robots used to be unable to decipher distorted text, so they always failed the ...

If you use the web for more than just browsing (that's pretty much everyone), chances are you've had your fair share of "CAPTCHA rage," the frustration stemming from trying to discern a marginally ...

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 ...

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 ...