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Usability of CAPTCHAs or usability issues in CAPTCHA design

Lookup NU author(s): Dr Jeff Yan, Ahmad Salah El Ahmad


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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.

Publication metadata

Author(s): Yan J, Salah El Ahmad A

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Proceedings of the Fourth Symposium on Usable Privacy and Security (SOUPS)

Year of Conference: 2008

Pages: 44-52

Publisher: ACM


Library holdings: Search Newcastle University Library for this item

Series Title: ACM International Conference Proceedings

ISBN: 9781605582764