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SOUPS
2009
ACM

Balancing usability and security in a video CAPTCHA

13 years 10 months ago
Balancing usability and security in a video CAPTCHA
We present a technique for using content-based video labeling as a CAPTCHA task. Our CAPTCHAs are generated from YouTube videos, which contain labels (tags) supplied by the person that uploaded the video. They are graded using a video’s tags, as well as tags from related videos. In a user study involving 184 participants, we were able to increase the human success rate on our video CAPTCHA from roughly 70% to 90%, while keeping the success rate of a tag frequency-based attack fixed at around 13%. Through a different parameterization of the challenge generation and grading algorithms, we were able to reduce the success rate of the same attack to 2%, while still increasing the human success rate from 70% to 75%. The usability and security of our video CAPTCHA appears to be comparable to existing CAPTCHAs, and a majority of participants (60%) indicated that they found the video CAPTCHAs more enjoyable than traditional CAPTCHAs in which distorted text must be transcribed. Categories an...
Kurt Alfred Kluever, Richard Zanibbi
Added 28 May 2010
Updated 28 May 2010
Type Conference
Year 2009
Where SOUPS
Authors Kurt Alfred Kluever, Richard Zanibbi
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