A security research team at Stanford University has developed a tool that can crack video CAPTCHAs with a success rate of more than 90 percent.

"The team focused on one of the first video CAPTCHA services called NuCaptcha when trying to figure out how to crack it," writes Geek.com's Matthew Humphries.

"The Stanford team admit that video capture is more difficult to solve than text-based CAPTCHA due to the motion involved," Humphries writes. "They’ve also used their research to feedback suggestions to NuCaptcha to make its system even more secure."

Go to "Video CAPTCHAs cracked by Stanford research team" to read the details.

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