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Usability of CAPTCHAs or usability issues in CAPTCHA design

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Publication date2008
Host publicationSOUPS 2008 - Proceedings of the 4th Symposium on Usable Privacy and Security
Place of PublicationNew York
PublisherACM
Pages44-52
Number of pages9
ISBN (Print)9781605582764
<mark>Original language</mark>English
Event4th Symposium on Usable Privacy and Security, SOUPS 2008 - Pittsburgh, PA, United States
Duration: 23/07/200825/07/2008

Conference

Conference4th Symposium on Usable Privacy and Security, SOUPS 2008
Country/TerritoryUnited States
CityPittsburgh, PA
Period23/07/0825/07/08

Conference

Conference4th Symposium on Usable Privacy and Security, SOUPS 2008
Country/TerritoryUnited States
CityPittsburgh, PA
Period23/07/0825/07/08

Abstract

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.