Usability of CAPTCHAs or usability issues in CAPTCHA design
Usability of CAPTCHAs or usability issues in CAPTCHA design
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.
CAPTCHA, Security, Usability
44-55
Association for Computing Machinery
Yan, Jeff
a2c03187-3722-46c8-b73b-439eb9d1a10e
El Ahmad, Ahmad Salah
e6e3d56d-a029-404f-aca6-14a8d54d2f43
23 July 2008
Yan, Jeff
a2c03187-3722-46c8-b73b-439eb9d1a10e
El Ahmad, Ahmad Salah
e6e3d56d-a029-404f-aca6-14a8d54d2f43
Yan, Jeff and El Ahmad, Ahmad Salah
(2008)
Usability of CAPTCHAs or usability issues in CAPTCHA design.
In SOUPS 2008 - Proceedings of the 4th Symposium on Usable Privacy and Security.
Association for Computing Machinery.
.
(doi:10.1145/1408664.1408671).
Record type:
Conference or Workshop Item
(Paper)
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.
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More information
Published date: 23 July 2008
Venue - Dates:
4th Symposium on Usable Privacy and Security, SOUPS 2008, , Pittsburgh, PA, United States, 2008-07-23 - 2008-07-25
Keywords:
CAPTCHA, Security, Usability
Identifiers
Local EPrints ID: 508337
URI: http://eprints.soton.ac.uk/id/eprint/508337
PURE UUID: 1bbdb920-fde6-4fc9-ab0d-ca5d9c3af82f
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Date deposited: 19 Jan 2026 17:36
Last modified: 19 Jan 2026 17:36
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Contributors
Author:
Jeff Yan
Author:
Ahmad Salah El Ahmad
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