Stanford researchers expose audio and video CAPTCHA vulnerabilities

Security researchers at Stanford University have created a computer program that can beat video CAPTCHA tests, with a success rate over 90%.

CAPTCHA tests are simple questions that appear on many online forms and are designed to be difficult for a computer programme to figure out, but easy for a person (for example, if you see an online form ask you to “type the red letters into the box below”, that’s a CAPTCHA test). They are often used to prevent automated spambots creating email accounts or posting in online discussions.

Recently, video CAPTCHA techniques such NuCaptcha have appeared on the market, and are marketed as being more reliable and secure than traditional text or audio CAPTCHAs. However, the researchers found that by having multiple frames of an image, NuCaptcha was often easier to break than traditional text or audio methods.

The news comes half a year after the same researchers announced that they could decode the audio CAPTCHAs with a 50% success rate. The purpose of the research is to identify security vulnerabilities in the methods before malicious hackers or spammers do, and suggest possible solutions to developers.

COMMENTS

Subscribe
Notify of
guest
0 Comments
Inline Feedbacks
View all comments
Close
SmartCompany Plus

Sign in

To connect a sign in method the email must match the one on your SmartCompany Plus account.
Or use your email
Show
Forgot your password?

Want some assistance?

Contact us on: support@smartcompany.com.au or call the hotline: +61 (03) 8623 9900.