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Issue No. 02 - March-April (2012 vol. 16)
ISSN: 1089-7801
pp: 44-51
Ahmad El Ahmad , Newcastle University,UK
Jeff Yan , Newcastle University, UK
Wai-Yin Ng , Chinese University of Hong Kong
ABSTRACT
<p>Most user interfaces use color, which can greatly enhance their design. Because the use of color is typically a usability issue, it rarely causes security failures. However, using color when designing CAPTCHAs, a standard security technology that many commercial websites apply widely, can have an impact on usability and interesting but critical implications for security. Here, the authors examine some CAPTCHAs to determine whether their use of color negatively affects their usability, security, or both.</p>
INDEX TERMS
CAPTCHAs, color, robustness, usability, Internet security
CITATION

A. E. Ahmad, W. Ng and J. Yan, "CAPTCHA Design: Color, Usability, and Security," in IEEE Internet Computing, vol. 16, no. , pp. 44-51, 2011.
doi:10.1109/MIC.2011.102
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