Usability of CAPTCHAs or usability issues in CAPTCHA design

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  2. Dr Jeff Yan
  3. Ahmad Salah El Ahmad
Author(s)Yan J, Salah El Ahmad A
Publication type Conference Proceedings (inc. Abstract)
Conference NameProceedings of the Fourth Symposium on Usable Privacy and Security (SOUPS)
Conference LocationPittsburgh, PA, USA
Year of Conference2008
Source Publication Date23-25 July 2008
Series TitleACM International Conference Proceedings
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CAPTCHA is now almost a standard security technology, and has found widespread application in commercial websites. Usability and robustness are two fundamental issues with CAPTCHA, and they often interconnect with each other. This paper discusses usability issues that should be considered and addressed in the design of CAPTCHAs. Some of these issues are intuitive, but some others have subtle implications for robustness (or security). A simple but novel framework for examining CAPTCHA usability is also proposed.
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